I just got a superchip for my 05 and when set on proformance getting around 20 on a 200 mile trip but if set on mileage only got about .2 tenths better on the same trip and i use 10% some times E20 % most of the time . the dealer told me if Iam not jumping on it I octane wouldn't 91 . Ihave 3in body lift,leveling kit, glass pack, and soon a k&n whole system when the truck gets out of body shop ( hit a deer ) 1800 DALLORS DAMAGE Fred from north Iowa

 

I've found on the highway the 91 tune was close to if not better than mileage (of course the 91 costs more). Somewhat recently with the start of colder weather here I switched from running the 91 tune pretty much all the time to the mileage tune. Driving around town and the 10-15 minute drive to work here in Jersey I saw a huge increase. I went from 10-11mpg average during the week to mid 14's. It seems to me you see a much bigger benefit from the mileage tune in city driving conditions.

 

altair thats good to know thats pretty much all the driving i do i will change my tune tomorow is that with 91 or 87 gas

 

The mileage tune is 87, it's still better than stock for power and you can still change the WOT shift points too. I left them up pretty high, it definitely lost some oomph from the 91 tune but it doesn't feel slow.

 

ok awesome and what are your wot set at

 

Ah geez I don't remember, I'd have to tune it again and check but I'm not sitting out there for 10 minutes right now, it's freakin cold out!

 

ya i no its freezing here also

 

Just some... lol I thought it was way noticeable

I been running the tow tune, only cause I been lazy, picking the trailer back up from the parents over xmas and not wanting to change it. I like this tune; good mileage still, good power, and good shifts.

I think I am still running mine around 5800 if I remember right.

 

Well yeah but it's definitely still better than stock, I didn't want to make it sound like it made the truck worse (using stock as the baseline)