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Old 08-13-2012, 11:13 PM   #1626
ans2k
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just calculate with about 90% highway doing 60-65mpg i got 37.5 taking into consideration that the odometer is 2.57% off.
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Old 08-14-2012, 06:17 AM   #1627
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just calculate with about 90% highway doing 60-65mpg i got 37.5 taking into consideration that the odometer is 2.57% off.
Awesome! What was your hand calculation without accounting for odometer error? How many miles are on your car?

The best I've done is hand calculated at 34.5 mpg, without accounting for any odometer error. But this was a road trip when I only had 1k miles on the car, so it wasn't fully broken in yet. And I had two adult passengers, luggage for three people, and was running A/C the whole way.
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Old 08-14-2012, 07:50 AM   #1628
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36.56ish. my car has about 11,6xx miles.
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Old 08-14-2012, 07:56 AM   #1629
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36.56ish. my car has about 11,6xx miles.
OK. I'm only at 3100 miles, so I'm expecting continued MPG improvement.

All this talk about odometer error makes me wonder if I should be recalculating my Fuelly data. But I haven't checked my own odometer accuracy yet, so I'm not sure how I would make that adjustment accurately. Is there any consistency with our cars, or is the error unique to each car? I'm guessing it's unique, with different cars having different wheels/tires, inflation pressures, tire wear rates, and so on.
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Old 08-14-2012, 09:04 AM   #1630
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Originally Posted by sgoldste01 View Post
OK. I'm only at 3100 miles, so I'm expecting continued MPG improvement.

All this talk about odometer error makes me wonder if I should be recalculating my Fuelly data. But I haven't checked my own odometer accuracy yet, so I'm not sure how I would make that adjustment accurately. Is there any consistency with our cars, or is the error unique to each car? I'm guessing it's unique, with different cars having different wheels/tires, inflation pressures, tire wear rates, and so on.
Exact calculation errors would really be to each individual vehicle, not necessarily a model or model variations. The only way you can truly know is to use a handheld gps to give you the most exact distance calculations over an extended range. Even that number will end up changing as tires wear. My odometer is about 2.3% under actual distance traveled. The Mercedes we traded in this spring was close to 9% inaccurate!
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Old 08-14-2012, 09:10 AM   #1631
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^correct. You would either need a automotive gps or a hand held gps. hand helds are more accurate but i took a long road trip enough to calculate it. you could measure the actual distance with the gps, divide by the miles recorded on odometer and then that would be the percent difference. you could take that percentage, go back into fuelly and go to edit trips. then, multiply every one of your mile trip and that should do it.
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Old 08-14-2012, 03:11 PM   #1632
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My fuelly average is up to 28.9, car is consistently over 30 over my last 5 tanks(calculated, not indicated mpg)

Exactly what i expected out of this car for my normal driving 70-80mph with some in town too.

Last edited by flyboy1100; 08-14-2012 at 05:19 PM.
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Old 08-14-2012, 04:30 PM   #1633
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^correct. You would either need a automotive gps or a hand held gps. hand helds are more accurate but i took a long road trip enough to calculate it. you could measure the actual distance with the gps, divide by the miles recorded on odometer and then that would be the percent difference. you could take that percentage, go back into fuelly and go to edit trips. then, multiply every one of your mile trip and that should do it.
Yeah an automotive one is certainly fine too, they both do the same thing. I happen to have a decent delorme handheld gps, and it is easier to reset and track simply based on distance without having to fiddle with all of the directions and menus on the in-car gps.
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Old 08-14-2012, 04:41 PM   #1634
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I'll have to see if I can figure out how to get my TomTom to tell me how far I've traveled. I know how to get it to tell me how far I have left until I reach my destination, but I've never used it to track distance already covered.
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Old 08-15-2012, 08:17 AM   #1635
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Quote:
Originally Posted by sgoldste01
I'll have to see if I can figure out how to get my TomTom to tell me how far I've traveled. I know how to get it to tell me how far I have left until I reach my destination, but I've never used it to track distance already covered.
Took me a while to find the feature on mine. I have a Garmin. There was a fuel economy app/section on mine that allowed me to track a trip from start to end. On mine I found the odo to be spot on. The tenth of a mile changed at the same time on my GPS as my odo.
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Old 08-15-2012, 11:10 AM   #1636
myrt1987
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Default 40+ mpg

In the entire life of the car ive averaged OVER 40MPG! ... kinda

(dont remember exact #'s)
about 40.2 according to digital read.
Calculated probably about 38 or 39.
75/25 city/hwy driving in summer months
Limited 4dr

Ive gotten max mpg to a science: cruising as much as possible, never accelerate up a hill, obviously never flooring it (unless you have to or for pleasure), warming up the car before driving, keeping speed constant, staying around speed limit unless going downhill...

Its not uncommon for me to see 42+mpg when i fill up (calculated about 39/40)

Lovin this car
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Old 08-15-2012, 11:48 AM   #1637
sgoldste01
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Nice job.

I'm seeing around 32 - 33 mpg on average. I'm doing most of what you're doing, except for letting car warm up before driving. How long do you let it idle? How long is your typical commute? Mine is approximately 20 miles. Do you use cruise control, or do you control speed with your own foot?

Also, I have the 5MT tranny, which I know creates a small penalty for gas mileage.
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Old 08-15-2012, 11:57 AM   #1638
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Originally Posted by myrt1987 View Post
In the entire life of the car ive averaged OVER 40MPG! ... kinda

(dont remember exact #'s)
about 40.2 according to digital read.
Calculated probably about 38 or 39.
75/25 city/hwy driving in summer months
Limited 4dr

Ive gotten max mpg to a science: cruising as much as possible, never accelerate up a hill, obviously never flooring it (unless you have to or for pleasure), warming up the car before driving, keeping speed constant, staying around speed limit unless going downhill...

Its not uncommon for me to see 42+mpg when i fill up (calculated about 39/40)

Lovin this car
Fuelly page? Or something similar?
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Old 08-15-2012, 12:11 PM   #1639
myrt1987
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Fuelly page? Or something similar?
no fuelly page, ive never heard of it until reading this thread honestly

Quote:
Originally Posted by sgoldste01 View Post
Nice job.

I'm seeing around 32 - 33 mpg on average. I'm doing most of what you're doing, except for letting car warm up before driving. How long do you let it idle? How long is your typical commute? Mine is approximately 20 miles. Do you use cruise control, or do you control speed with your own foot?

Also, I have the 5MT tranny, which I know creates a small penalty for gas mileage.
Thanks!

I just let it idle until the cold temp indicator goes away. Typical commute is about 3.5 hours a day, 70 or so miles.

Im glad you asked i forgot to mention. I never use cruise control, CC wastes gas going up hills because its trying to compensate for losing speed so it accelerates. Instead try keeping rpms constant the entire ride. 5MT would create small penalty, esp. on city miles imo.
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Old 08-15-2012, 12:38 PM   #1640
sgoldste01
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Im glad you asked i forgot to mention. I never use cruise control, CC wastes gas going up hills because its trying to compensate for losing speed so it accelerates. Instead try keeping rpms constant the entire ride. 5MT would create small penalty, esp. on city miles imo.
OK, thanks for the tips. I think your longer commutes is the main difference between how you and I drive that gives you a huge advantage. As we all know, the car's gas mileage is awful while the car is warming up, say for the first 5 miles of the drive. In my case, I spend the remaining 15 miles of my drive compensating for the first 5 miles of the drive in an attempt to bring my fuel economy back up over 30 MPGs again.

Your commute is much longer, so you have more time and miles with which to compensate for the first few inefficient miles of the trip.

I'm sure this effect will only get worse in the winter, when the extreme cold might mean the car doesn't warm up until after the first 8 or 10 miles, rather than only the first 5 miles, thereby giving us even fewer miles with which to compensate for the first inefficient miles.
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Old 08-15-2012, 01:52 PM   #1641
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I agree my route allows me to get a higher mpg, plus with gas prices and this commute I NEED to keep an eye on mpg to keep expenses down.

Dont get me started on winter. Im reading horror stories of drastically lower fuel economy in winter at the start of this thread.

Hopefully it was due to factory-fresh engines.
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Old 08-15-2012, 02:16 PM   #1642
sgoldste01
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I'm sure it was both the temps and the engines that weren't broken in yet.
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Old 08-15-2012, 03:06 PM   #1643
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I'm sure it was both the temps and the engines that weren't broken in yet.
I had 3K miles on my car within the first few days of ownership (before winter set in) and my winter MPGs were dreadful throughout the whole winter. 3K miles should cover break in on a modern gas engine, regardless of what Subaru says ("10K miles"). I pulled under 24MPG on one tank, and my overall average is currently around 32MPG.
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Old 08-15-2012, 03:07 PM   #1644
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Im glad you asked i forgot to mention. I never use cruise control, CC wastes gas going up hills because its trying to compensate for losing speed so it accelerates.
Of course that means you are just one of those people not maintaining speed and creating a slow hazard while traveling on a public road
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Old 08-15-2012, 03:13 PM   #1645
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Of course that means you are just one of those people not maintaining speed and creating a slow hazard while traveling on a public road
Ocel, if you ever move to my neighborhood, I'll give you the $10/yr you're saving just so I don't have to granny-drive behind you.
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Old 08-15-2012, 03:16 PM   #1646
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Ocel, if you ever move to my neighborhood, I'll give you the $10/yr you're saving just so I don't have to granny-drive behind you.
I always maintain speed, myrt1987 needs the $10
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Old 08-15-2012, 03:23 PM   #1647
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I always maintain speed, myrt1987 needs the $10
If you maintain speed while climbing hills, then how is what you're doing with your foot different from what the cruise control does?
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Old 08-15-2012, 03:24 PM   #1648
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If you maintain speed while climbing hills, then how is what you're doing with your foot different from what the cruise control does?
*blink* I think you missed a few posts. I use cruise control like crazy, I have never said differently.
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Old 08-15-2012, 03:36 PM   #1649
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*blink* I think you missed a few posts. I use cruise control like crazy, I have never said differently.
Oh, I guess my comment was directed at myrt1987.
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Old 08-15-2012, 04:44 PM   #1650
pxpaulx
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Oh, I guess my comment was directed at myrt1987.
If myrt's commute is 70 miles a day at 38mpg (approximate calculated...if he is calculating right!) and $3.80/gallon, if he only got 32mpg it would cost him an additional $340/year. I'll drive faster if you want to pay me that much money, promise!

Myrt, is your commute 70 miles 1 way? 3.5 hours seems like a lot of time for just 70 miles...if it is 140 total double the numbers above!

Also Myrt, you've gotta start backing those numbers up with a fuelly page so we can all be jealous - these are the internets afterall - proof or it didn't happen!
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