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Old 09-13-2013, 09:38 AM   #4826
Zeeper
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Quote:
Originally Posted by stevehnm View Post
The higher the elevation the less air the car is pushing, and today's fuel management systems compensate for elevation so mpg increases with increased elevation. That's one of those "your mileage may vary" things. If you trace your route on a topo map you will typically find that the grade doesn't vary much very often - that's a highway design priority. My Corolla that is also rated at 36 mpg highway gets 40 mpg (summer gas, no AC) at 80 mph at 5,000 ft elevation! That's a whole bunch better than my Impreza CVT.
Hint: As far as I can tell nobody gives a crap about your old toyota corolla and nobody wants to hear about it on the Impreza forum.

I'd venture to guess that nobody would even want to take it for a drive, if you offered it to them for the day...

But ask some others, maybe I am reading them wrong...
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Old 09-13-2013, 11:09 AM   #4827
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Quote:
Originally Posted by stevehnm View Post
The higher the elevation the less air the car is pushing, and today's fuel management systems compensate for elevation so mpg increases with increased elevation. That's one of those "your mileage may vary" things. If you trace your route on a topo map you will typically find that the grade doesn't vary much very often - that's a highway design priority. My Corolla that is also rated at 36 mpg highway gets 40 mpg (summer gas, no AC) at 80 mph at 5,000 ft elevation! That's a whole bunch better than my Impreza CVT.
I understand that, the issue wasn't the elevation but the considerable changes (and frequency of those changes) that knocked the fuel economy back a bit. There were a lot of straight sections on the route I took (just take a look a map of south eastern Oregon and Nevada) and on the level-ish sections the computer displayed fuel economy was in the high 30's or low 40's.

I used a Garmin the whole trip and it was interesting to watch the altitude change on a road that looked pretty flat.
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Old 09-13-2013, 12:18 PM   #4828
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Quote:
Originally Posted by Zeeper View Post
Hint: As far as I can tell nobody gives a crap about your old toyota corolla and nobody wants to hear about it on the Impreza forum.

I'd venture to guess that nobody would even want to take it for a drive, if you offered it to them for the day...

But ask some others, maybe I am reading them wrong...
Actually you are wrong. I can count on one hand the number of people here who don't understand that the EPA numbers are for comparison.
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Old 09-13-2013, 02:29 PM   #4829
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Would that one hand only involve one finger named Stevehnm?
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Old 09-13-2013, 03:44 PM   #4830
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C'mon guys - don't you know ADM is broke? Don't you feel sorry for their stockholders? It's just big business, scamming the American people and starving the rest of the world so they can make ethanol out of corn instead of feeding people...

They really deserve those trainloads of cash shipped from Washington that they get by just spending a little "donating" to politicians who give them their votes.

Don't they?
its more the idea that the land is being used to make fuel rather than food.. im not sure i would want to feed people with the type of corn used to make fuel
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Old 09-13-2013, 04:11 PM   #4831
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Corn is subsidized which is why it's so cheap and used for everything they can think of: animal feed, sweetener, fuel, cat litter, etc.
And it doesn't matter how much food you have, starving people still have to buy the food, and they can't afford it.
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Old 09-13-2013, 05:35 PM   #4832
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Quote:
Originally Posted by stevehnm View Post
The higher the elevation the less air the car is pushing, and today's fuel management systems compensate for elevation so mpg increases with increased elevation. That's one of those "your mileage may vary" things. If you trace your route on a topo map you will typically find that the grade doesn't vary much very often - that's a highway design priority. My Corolla that is also rated at 36 mpg highway gets 40 mpg (summer gas, no AC) at 80 mph at 5,000 ft elevation! That's a whole bunch better than my Impreza CVT.
So, why are you still driving the Impreza? Not much of an Engineer if you cannot figure out that your Corolla is a superior piece of engineering.
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Old 09-13-2013, 06:56 PM   #4833
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The more the government subsidizes corn, the more perverted uses for it industry will find.

Corn employs farmers, dentists to fix decaying teeth, mechanics to repair trashed fuel systems, doctors and pharmacists to manage type II diabetes and obesity, and many others.

All of these generate a nice "stimulus" for government at all levels through taxable events. This is the broken window fallacy, and you are the window.
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Old 09-13-2013, 07:02 PM   #4834
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Originally Posted by auskip07 View Post
its more the idea that the land is being used to make fuel rather than food.. im not sure i would want to feed people with the type of corn used to make fuel
They grow the type of corn that they can make the most money off of. If there is less of a market for "fuel corn" they will make "people food corn".

Of course it's questionable how healthy corn is for us now anyway, being genetically modified...
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Old 09-13-2013, 09:36 PM   #4835
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Quote:
Originally Posted by Commander Keen View Post
The more the government subsidizes corn, the more perverted uses for it industry will find.

Corn employs farmers, dentists to fix decaying teeth, mechanics to repair trashed fuel systems, doctors and pharmacists to manage type II diabetes and obesity, and many others.

All of these generate a nice "stimulus" for government at all levels through taxable events. This is the broken window fallacy, and you are the window.
Again - x2!!!! Ethanol is great for race engines of mid range power, but beyond that its smoke and mirrors.
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Old 09-13-2013, 09:40 PM   #4836
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Quote:
Originally Posted by stevehnm View Post

They grow the type of corn that they can make the most money off of. If there is less of a market for "fuel corn" they will make "people food corn".

Of course it's questionable how healthy corn is for us now anyway, being genetically modified...
That's another topic for another forum, GMO's, but its a discussion that needs to be had.
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Old 09-14-2013, 01:53 AM   #4837
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I just had a revelation. I used 89 octane midgrade this last tank and got a significant boost even with everything else being relatively normal. This last tank is 28.8mpg hand calculated. The previous 5 tanks were all mid-26mpg. Trip computer average was off about 1 mpg instead of the usual ~2 mpg. There was noticeably more pep in her step too.
http://www.fuelly.com/driver/hemophilic/impreza

I know modern engine control allows for higher compression with lower grade gas but this really makes me wonder. The manual recommends 87 but our 2.0 is a 10.5:1 compression ratio. All of the stuff I've googled suggests higher octane is recommended. Yeah the engine can retard timing to make lower octane work but I'm thinking at least breaking even on more expensive gas to get more range and power is worth it.

Per this: http://www.caranddriver.com/features...economy-page-2
"The EPA has a specialized company manufacture small batches of consistent fuel, which is 93 octane (cars running 50-state certifications get a slightly different, 91-octane “California” blend)."

I filled up with 89 again but wonder what premium 93 would yield. My guess is that the performance/mpg gain wouldn't be worth it.
My station today:
3.49 Reg
3.64 Mid
3.79 Prem
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Old 09-14-2013, 08:45 AM   #4838
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Quote:
Originally Posted by hemophilic View Post
I just had a revelation. I used 89 octane midgrade this last tank and got a significant boost even with everything else being relatively normal. This last tank is 28.8mpg hand calculated. The previous 5 tanks were all mid-26mpg. Trip computer average was off about 1 mpg instead of the usual ~2 mpg. There was noticeably more pep in her step too.
http://www.fuelly.com/driver/hemophilic/impreza

I know modern engine control allows for higher compression with lower grade gas but this really makes me wonder. The manual recommends 87 but our 2.0 is a 10.5:1 compression ratio. All of the stuff I've googled suggests higher octane is recommended. Yeah the engine can retard timing to make lower octane work but I'm thinking at least breaking even on more expensive gas to get more range and power is worth it.

Per this: http://www.caranddriver.com/features...economy-page-2
"The EPA has a specialized company manufacture small batches of consistent fuel, which is 93 octane (cars running 50-state certifications get a slightly different, 91-octane “California” blend)."

I filled up with 89 again but wonder what premium 93 would yield. My guess is that the performance/mpg gain wouldn't be worth it.
My station today:
3.49 Reg
3.64 Mid
3.79 Prem
I wish premium was only another 0.15 here, it is usually another 0.35-.45 which negates any gains in mpg.

I don't think you would see much difference between 89-93, unless you have a scanner and can monitor timing
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Old 09-14-2013, 09:22 AM   #4839
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I know mine does, I'm not sure if its octane or noE since I run 91nE, but power and mpg both better.
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Old 09-16-2013, 09:05 PM   #4840
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Halfway through a tank of 87E0, averaging 39.3 MPG with 60% highway miles.
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Old 09-16-2013, 09:07 PM   #4841
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I think the key is noE. I wise I could try an 87 noE. Havnt seen it around here
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Old 09-16-2013, 10:49 PM   #4842
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Quote:
Originally Posted by hemophilic View Post
I know modern engine control allows for higher compression with lower grade gas but this really makes me wonder. The manual recommends 87 but our 2.0 is a 10.5:1 compression ratio. All of the stuff I've googled suggests higher octane is recommended. Yeah the engine can retard timing to make lower octane work but I'm thinking at least breaking even on more expensive gas to get more range and power is worth it.
Yeah, I was wondering the same thing last month about the recommended octane vs this high compression engine (post# 4759).

We're in the same state, about an hour apart. I just found out 2 weeks ago my car is a PZEV. What about yours?
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Old 09-17-2013, 01:40 AM   #4843
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Nice numbers! How many miles on the odo do you have?
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Old 09-17-2013, 02:08 PM   #4844
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Quote:
Originally Posted by hemophilic View Post
I just had a revelation. I used 89 octane midgrade this last tank and got a significant boost even with everything else being relatively normal. This last tank is 28.8mpg hand calculated. The previous 5 tanks were all mid-26mpg. Trip computer average was off about 1 mpg instead of the usual ~2 mpg. There was noticeably more pep in her step too.
http://www.fuelly.com/driver/hemophilic/impreza

I know modern engine control allows for higher compression with lower grade gas but this really makes me wonder. The manual recommends 87 but our 2.0 is a 10.5:1 compression ratio. All of the stuff I've googled suggests higher octane is recommended. Yeah the engine can retard timing to make lower octane work but I'm thinking at least breaking even on more expensive gas to get more range and power is worth it.

Per this: http://www.caranddriver.com/features...economy-page-2
"The EPA has a specialized company manufacture small batches of consistent fuel, which is 93 octane (cars running 50-state certifications get a slightly different, 91-octane “California” blend)."

I filled up with 89 again but wonder what premium 93 would yield. My guess is that the performance/mpg gain wouldn't be worth it.
My station today:
3.49 Reg
3.64 Mid
3.79 Prem
are all of these blends E10?

i have long wanted to try E0, even if it were premium just to see the difference, but all blends in the SF Bay Area, as far as i know are E10 regardless of octane rating.
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Old 09-17-2013, 02:35 PM   #4845
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Quote:
Nice numbers! How many miles on the odo do you have?
279.5 mi so far and the fuel gauge is one bar under half.

Update: 39.3 MPG, 344.5 mi, 34 MPH average, 3 bars of fuel left.

Last edited by Commander Keen; 09-18-2013 at 01:02 PM.
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Old 09-18-2013, 06:36 PM   #4846
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Quote:
Originally Posted by CLL_OBP View Post
Yeah, I was wondering the same thing last month about the recommended octane vs this high compression engine (post# 4759).

We're in the same state, about an hour apart. I just found out 2 weeks ago my car is a PZEV. What about yours?
Yeah, mine is a PZEV too. An hour which way? and do you have a Fuelly link?
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Old 09-18-2013, 06:37 PM   #4847
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Quote:
Originally Posted by nubsub View Post
are all of these blends E10?

i have long wanted to try E0, even if it were premium just to see the difference, but all blends in the SF Bay Area, as far as i know are E10 regardless of octane rating.
I believe they are. NC is an "up to 10% ethanol" state.
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Old 09-18-2013, 07:27 PM   #4848
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Originally Posted by hemophilic View Post
Yeah, mine is a PZEV too. An hour which way? and do you have a Fuelly link?
I guess we got lucky to end up with a PZEV in a non-PZEV state, lol. I'm just south of Fayetteville. Here's my fuelly: http://www.fuelly.com/driver/cllobp/impreza
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Old 09-18-2013, 10:03 PM   #4849
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Agreed. I figured that since I bought early I wouldn't have to get a PZEV. I don't mind it to much except for the warmup time in the winter. But, I figure the Subaru engineers know what they're doing to keep air clean and my car running reliably.

I think they eventually went PZEV on all Imprezas.

My fuelly
http://www.fuelly.com/driver/hemophilic/impreza
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Old 09-18-2013, 10:07 PM   #4850
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Yup, all 2013 Impreza's are PZEV.

By the way, anyone notice the new Honda accord commercial that totally ripped off the Subaru commercial (i.e. you buy an accord, take your daughter on a date, and ten years later she is driving it off to college?)

LOL
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