I didn't have my car very long before the switch occured to the 10% ethanol mix up here. With MTBE in the gas I was averaging 29-30 mpg combined highway and city per tank (~400 miles) for about 3 tanks. Then ethanol came and now I get no more than 28 mpg combined per tank, so maybe it has had some effect on my mileage. It's nothing conclusive because the numbers are so close. Also, if there are weeks where I dig into the turbo more, my mileage suffers so it's not really anything to draw conclusions by.

The worst I've seen on ethanol mix is 21 mpg, but that was when I floored it everywhere. The best is 28 mpg over long trips.

All of this was with 93 octane.

 

E85 requires running roughly 30% more fuel so figuring your 93 octane is 10% ethanol you will have your gas mileage decrease by like 3.5% (im guessing here)

 

dang, and she's smart too! :lol: :wink:

thats exactly what i was gonna post, ya beat me to it!

Paul

 

well 29/28 is 3.57 percent... I got my 9k just as the pumps was being switched over. And in my c900 the odometer didn't work. My dad claims his mileage has dropped since ethanol replaced mtbe as well.. but then I found out today that his alignment is off, cupping the rear tires.

 

cool i was .07 off! woot! :lol:

 

Kaylan, I'm impressed.

 

As far as I knew all she could do was drink and spend money! Often at the same time!

Weird how you can live with someone for 19 years and never known they could add.

I'm drunk.

 

:lol:

Paul

 

Now I know to watch out for that play Kaylan when I'm at a party. Thanks

 

never trust a girl and her brother

 

You just wanted to get Quinn drunk and passed out so the holy sharpie could get passed around on him lol.

 

I never did any math in highschool! nor did i turn in any homework!

Don't acuse me of trying to succeed ever again

 

all math aside...when I ran E85 in my old Ranger, I got roughly 2 mpg less on average. maybe 1.5mpg. But it did top out at a staggering 108mph instead of the paltry 107mph the regular 87 got me.

The only time I've ever run not oxygenated in my car I got better mileage...32 instead of 30, but I probably had a lower average speed or something...hardly scientific.

 

ya, i noticed the 10% ethanol gets slightly worse gas mileage, but i noticed a difference in performance, my car likes the ethanol additive better

 

Thank you all for the info, it appears that my drop is a bit larger than can be attributed to just the gasoline. I have my last CPO checkup on Monday so hopefully they'll pick something up.

Paul

 

The computer can adapt slightly to your driving style. It could be that your an agressive driver and it knows that. I'm not too familiar with T7, but on T5 cars, I do believe resetting the computer and driving really economical will greatly improve your mileage, as the computer learns what your looking for.

 

wow quinn, im impressed.

Your right foot is probably the problem so unless you take a mechanic out for a drive i dont think the dealer will have much to say about it I think the lowest i got at one point in my 9000 Aero was 18MPG.... thats when i slowed down a bit :shock:

 

Mom's CSE got around 30, and the cars are really similar. Her car also didn't boost as high on the guage as it should, and mike leonard said its because of her driving style, affecting the computer.

 

Mom's CSE got around 30, and the cars are really similar. Her car also didn't boost as high on the guage as it should, and mike leonard said its because of her driving style, affecting the computer.

yep i believe it... thats why i have to drive fast all of the time... So my computers used to pnwing ricers... see like zingzach said a long time ago, i solve everything by driving faster.

 

Yeah but it works.

 

I'm sure that the right foot causes some of the gas mileage issues but I didn't drive much differently last summer and winter. I'd love for my ECU to think I want to fly, maybe it wouldn't sit halfway in the yellow and slowly creep up to the red on full throttle.

 

The whole ethanol thing enthralls me. I have toyed with the idea of burning straight alky but don't know enough about the fuel maps to jump off that bridge. Ethanol is actually a lot cleaner burning and is higher octane that gas. However the air/fuel ratio needs to be different higher air lower fuel than gas. And finally for all you boost junkies, alcohol lowers combustion temperatures while releasing more energy than gas. Lower combustion temps= higher boost without piston holes! Somebody swap injectors, fpr, and kick the boost up while running straight alcohol and let me know if it works or my theory is all washed up.