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Old 01-18-2013, 12:19 PM   #3001
sgoldste01
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Quote:
Originally Posted by Xafen View Post
It's all about combining E0, pure highway driving, average speed 60-65 mph, and roadway that allows you to just set it in manual mode in 6th gear.
Agreed. What's disappointing to me is the difficulty and cost associated with running E0. Very few gas stations near me provide an E0 choice (most are E10). Of the few stations that do provide E0, it's only on their premium gas product, so I'm forced to pay extra for the premium octane rating.

I wish I could get regular unleaded (87 octane) that's also E0, but I can't. So I've been running E10 and accepting lower MPGs, although I typically average around 30-32, which isn't too bad.

My car has the manual tranny.
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Last edited by sgoldste01; 01-18-2013 at 02:22 PM.
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Old 01-18-2013, 12:23 PM   #3002
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Originally Posted by 2012ISport View Post
And yes our mpg gauge is consistently off 1.5 -2.0 mpg which is another issue I have with the car.
The MPG gauge isn't as off as you might think. Another problem with our cars is that the odometer reads low by approximately 2.7% (compare your odometer with a GPS reading on a long trip, and you'll see what I mean). Once you adjust for the odometer error, the calculated MPG gets pretty close to accurate (approximately 1 MPG error).

If you're going to go through the trouble of hand calculating MPGs, you should also correct for the 2.7% odometer error.
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Old 01-18-2013, 12:30 PM   #3003
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Originally Posted by sgoldste01 View Post

The MPG gauge isn't as off as you might think. Another problem with our cars is that the odometer reads low by approximately 2.7% (compare your odometer with a GPS reading on a long trip, and you'll see what I mean). Once you adjust for the odometer error, the calculated MPG gets pretty close to accurate.

If you're going to go through the trouble of hand calculating MPGs, you should also correct for the 2.7% odometer error.
I will look into that thank you for the suggestion. However even if my odometer is off 2.7% it will still only increase the mpg by .81 if I achieve 30mpg. My odometer would need to be off by at least 5% to account for the difference.
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Old 01-18-2013, 12:40 PM   #3004
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Have one slight question when it comes to driving this car.(Note this is my fist Subaru/AWD vehicle). I find it very difficult to "coast" in this car without the rpms hovering at around 2.5(which as noted contributes to an extreme drop in fuel efficiency). Is this because of the CVT or the mechanics of the car itself. I have yet to find a sweet spot for feathering the gas unless i'm at 50-60 mph+ on the highway.

Just to throw out an example. My ex has a Versa 1.8 (of course FWD and and much ligther and IMO rickety POS) No matter what speed I can find a good medium at which to press the gas and drive at a normal pace. With the Impreza if i am under 50 mph it's nearly hit or miss. I press the gas to get up to speed and then I either have to keep on the gas to maintain said speed or when I try to lighten up on the gas of course I'm either not pressing hard enough and the cars decels OR when trying to find that ideal positioning my mpg meter hovers between 18-25mpg...

Mind you this is on what I see to be pretty flat terrain.
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Old 01-18-2013, 12:40 PM   #3005
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Quote:
Originally Posted by sgoldste01 View Post

No it's not, if the snapshot includes a significant number of accumulated miles on the trip odometer.
But but but....
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Old 01-18-2013, 12:57 PM   #3006
sgoldste01
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Quote:
Originally Posted by 2012ISport View Post
I will look into that thank you for the suggestion. However even if my odometer is off 2.7% it will still only increase the mpg by .81 if I achieve 30mpg. My odometer would need to be off by at least 5% to account for the difference.
Understood, accounting for the 2.7% odometer error doesn't fully compensate for the MPG error. But it does make the MPG error smaller.
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Old 01-18-2013, 01:15 PM   #3007
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Quote:
Originally Posted by Zauri View Post
Have one slight question when it comes to driving this car.(Note this is my fist Subaru/AWD vehicle). I find it very difficult to "coast" in this car without the rpms hovering at around 2.5(which as noted contributes to an extreme drop in fuel efficiency). Is this because of the CVT or the mechanics of the car itself. I have yet to find a sweet spot for feathering the gas unless i'm at 50-60 mph+ on the highway.

Just to throw out an example. My ex has a Versa 1.8 (of course FWD and and much ligther and IMO rickety POS) No matter what speed I can find a good medium at which to press the gas and drive at a normal pace. With the Impreza if i am under 50 mph it's nearly hit or miss. I press the gas to get up to speed and then I either have to keep on the gas to maintain said speed or when I try to lighten up on the gas of course I'm either not pressing hard enough and the cars decels OR when trying to find that ideal positioning my mpg meter hovers between 18-25mpg...

Mind you this is on what I see to be pretty flat terrain.
i think that is the engine braking designed into the CVT. have you tried your manual mode?
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Old 01-18-2013, 01:16 PM   #3008
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Would this odometer error be connected in some way to a speedometer error? It might be worth it to corroborate this as well. Could be programmed wrong from the factory based on tire sizes?
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Old 01-18-2013, 01:19 PM   #3009
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Originally Posted by foghelmut View Post
Would this odometer error be connected in some way to a speedometer error? It might be worth it to corroborate this as well. Could be programmed wrong from the factory based on tire sizes?
no speedometer error so far on anyone's car with factory tire/wheel combo. just odometers anywhere from 2.7-3.3% it seems. mine is 2.9*% off.
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Old 01-18-2013, 01:23 PM   #3010
sgoldste01
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Originally Posted by flyboy1100 View Post
i think that is the engine braking designed into the CVT. have you tried your manual mode?
And have you received the latest firmware update, which I've heard reduces the overly aggressive engine-braking?

(Note: my car doesn't have the CVT, so I don't have personal experience with the CVT or how the firmware update changes the CVT's behavior.)
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Old 01-18-2013, 02:14 PM   #3011
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I don't think we've touched too much on weight issues. My recent almost 4k mile road trip to Las Vegas didn't return near as good of mpg as I was expecting.

http://www.fuelly.com/driver/xafen/impreza fillup 15-23 was this roadtrip...

In this roadtrip I was traveling with someone else, and we had the car fully loaded with camping stuff, wedding stuff, and misc other stuff.

That trip I took to Minneapolis and back, I had half a light suitcase and nothing else in the car.

The best I did on that LV roadtrip was ~37 mpg. The Minneapolis trip was ~40. Add a couple to know what it displayed on the dash.

If 2012ISport were fully loaded on his 400 mile trip on I-90, my difference of ~3 mpg unloaded, and ~3-4 mpg for E10 would put him at exactly my range of mpg.

Weight?

Last edited by Xafen; 01-18-2013 at 02:22 PM. Reason: lots of posts between edits
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Old 01-18-2013, 02:28 PM   #3012
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Originally Posted by Xafen View Post
Weight?
Good point. I'm about to take a trip from NY to MD (approximately 380 miles each way, plus whatever driving we do while we're in MD). The car will be loaded with 4 people, their luggage, and one small dog. To carry all this, I will have my Yakima car-top carrier installed. I have snow tires installed. Winter gas. And the roads through PA are very hilly.

I expect my average MPGs for the trip to be below 30, and I'm not going to be upset if I'm right. There are just too many factors working against a good MPG result.
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Old 01-18-2013, 02:40 PM   #3013
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Quote:
Originally Posted by 2012ISport View Post
41.4 mpg over 363 miles, that's impressive! Please provide more information on how you achieved that average mpg. Driving conditions? Gas e10 or ethanol free? Outside temp? Average speed?

I'm confident that those numbers could not be reached with my Impreza. Like previously stated my wife and I took a road trip to NYC last summer and only got 30.5 mpg cruising at 65 mph. Last month we took a trip to New Jersey to help with the hurricane Sandy clean up and could not exceed 30 mpg cruising at 70 mph.

Could someone please explain how 1 person could get 40 + mpg and I can barely get above 30?
Lol i love posting my numbers here.

I USUALLY get 38-42 mpg lol

I have posted this before but its mainly because my commute is on long 50-55mph roads (with lights) and highways which i do not speed over the limit 65 (usually hover around 62ish on flat ground)

Other things that contribute are driving without brakes (i.e. coasting alot, slow accelerations) I also let my car warm up before driving, whether or not that helps is debatable. I do not switch to manual mode on highway nor use cruise control.

ALSO this is on 87octane, 10e wawa gas

This car cannot coast 70+mph maintaining 40+mpg

I will also admit this is about 1-3mpg more then i usually get during winter.
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Old 01-18-2013, 03:09 PM   #3014
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Quote:
Could someone please explain how 1 person could get 40 + mpg and I can barely get above 30?
Driving style
Tire inflation
Driving style
Trip length
Driving style
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Old 01-18-2013, 03:13 PM   #3015
sgoldste01
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Quote:
Originally Posted by Commander Keen View Post
Driving style
Tire inflation
Driving style
Trip length
Driving style
Type of gas
Driving style
Flatness vs. Hilliness of the roads
Driving style
Wind speed
Driving style
Type of tires installed
Driving style
Type of transmission
Driving style
Outdoor temp
Driving style
Etc.
Driving style
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Old 01-18-2013, 03:23 PM   #3016
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Quote:
Flatness vs. Hilliness of the roads
I can actually pull better numbers on hilly terrain than flat. 5th gear, 75% throttle on the way up, 0% throttle (and fuel usage) on the way down.
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Old 01-18-2013, 03:24 PM   #3017
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Quote:
Originally Posted by sgoldste01 View Post

Type of gas
Driving style
Flatness vs. Hilliness of the roads
Driving style
Wind speed
Driving style
Type of tires installed
Driving style
Type of transmission
Driving style
Outdoor temp
Driving style
Etc.
Driving style
You forgot car color
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Old 01-18-2013, 03:43 PM   #3018
Zauri
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Originally Posted by flyboy1100 View Post
i think that is the engine braking designed into the CVT. have you tried your manual mode?
I 'accidentally' switched into that once lol, haven't done a full day with it though.
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Old 01-18-2013, 03:58 PM   #3019
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Quote:
Originally Posted by sgoldste01 View Post

Type of gas
Driving style
Flatness vs. Hilliness of the roads
Driving style
Wind speed
Driving style
Type of tires installed
Driving style
Type of transmission
Driving style
Outdoor temp
Driving style
Etc.
Driving style
How can driving style come into play when you are cruising at 65 mph on the highway? Also, on the trip I took to NYC in the car was me (175lbs) my wife (105lbs) and about 60 lbs of luggage. Not an excessive amount of weight by any means and weight is a very small factor in highway fuel economy due to momentum and the laws of physics.
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Old 01-18-2013, 04:03 PM   #3020
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I have stock tires and avg mph is probably high 30s too, temp was pretty cold 38-42 that week, maybe one warm day (50) that was responsible for 1-2 mpg boost.
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Old 01-18-2013, 04:12 PM   #3021
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Quote:
Originally Posted by 2012ISport View Post
How can driving style come into play when you are cruising at 65 mph on the highway? Also, on the trip I took to NYC in the car was me (175lbs) my wife (105lbs) and about 60 lbs of luggage. Not an excessive amount of weight by any means and weight is a very small factor in highway fuel economy due to momentum and the laws of physics.
you have to get to the highway, you have to accelerate, there might be traffic to pass or pass you, you have to slow down and you have to exit. no 2 drivers will do that the same.
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Old 01-18-2013, 04:28 PM   #3022
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I commute 250 miles a week to school with the majority of the trip being 55mph speed limit, with few lights in between. I have tried with cruise on and off, best I have gotten one way is 36mpg. I filled up last night and got 30.7mpg for the tank, with 70% of the tank being highway miles.

I got the car mid November and saw 31+mpg for the tank, and even got 38mpg on a trip to FL. I changed my oil at 3000 miles to amsoil OE. I am not sure if its the temperature, oil change, winter fuel switch, or other factors, but since my oil change my mpg has dipped slightly. I am guessing that it is manly due to the temperature being colder.
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Old 01-18-2013, 04:29 PM   #3023
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Quote:
Originally Posted by Zeeper View Post
I totally agree. That is why the best snapshot is the 1.5 million miles tracked on Fuelly. Overall average of 27.7mpg combined. Mix of 5 Speeds and CVT's.

Within 1-2 mpg of the average expected for 5 speeds and CVT's (5 speeds=28, CVT=30).
The overall average on Fuelly was 29.0 before the cold weather kicked in. I know that's when my mileage went down. Then again, that was about the time I put in my Weathertech liners. Maybe the liners are ruining my mileage.
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Old 01-18-2013, 04:44 PM   #3024
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Originally Posted by tomwi53092 View Post

The overall average on Fuelly was 29.0 before the cold weather kicked in. I know that's when my mileage went down. Then again, that was about the time I put in my Weathertech liners. Maybe the liners are ruining my mileage.
Extra weight. Makes sense to me
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Old 01-18-2013, 04:54 PM   #3025
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Now ya'll made it sound like there is a whole range of possible MPG's with this car...

I am completely disappointed, I was told by someone here that 5 speeds meet or exceed the EPA numbers, so we can't talk about the CVT's (all of them) that fall far short.

But now I hear some drivers with CVT's are actually exceeding the EPA estimates, and my car is more than 1/10th's of an MPG off the mark (lifetime Combined MPG is now only 27.89 -- and I drive pretty conservatively!).

Where do I get my refund?
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