Well, I had to get gas at work a few months ago and a Sunoco was the nearest gas station so I stopped and filled up. I always had went to Shell before that but, one was not near where I was at. After a couple more fill ups(Some at Shell, some at Sunoco) I noticed that sometimes my mileage would be 21.6+/- mpg and sometimes it would be right at 20.5 mpg. I decided to see if it was the Sunoco gas making the difference so I filled up with Shell for a few fillups(2 a week average). Sure enough I was just barely getting 20.5mpg. So the last couple fill ups I used Sunoco and have been getting 21.6mpg. It only takes 3 days to run through a tank of gas and the trip is pretty much the same all the time so these results I feel are pretty accurate.

I don't know what that V-Power crap has in it but, Shell just got my last dollar.

Anyone else notice a difference in mileage between different gas stations?

BTW, this was in my car as my truck is on jackstands for a transmission swap(waiting on a trans jack from harbor freight)

 

yelp same here shell i get 20.5 and with exxon i get 18, but on a side note i get better times with exxon then i do shell. Go figure lol.

 

Don't have it here. I use to run Sunoco 260 (105 octane,old way of rating it?) in my 71 Demon 340...seemed to run a little quicker. Now I just use what is cheapest.

 

There are to many variables to determine if its the gas that is giving you better mpg. I bet just thinking about getting better gas milage will give you a 1mpg increase

 

Ive always had good luck with sunoco gas theres one of there stations around here that sells 110

 

Hell, I dont know....I spend too much time in PE to tell.

 

I do know Exxon gas performes much better in my truck than Diamond Shamrock. I get about 1 mpg gallon better and no pinging. Diamond Shamrock pings like an alarm clock.

 

When I get tired of tuning out kr in closed loop, I just set the pe mode to like 10% tps

 

hmmm how the hell do u get 20 mpg. and i get 11.5 on a good day... this tahoe has horrible horrible gas mileage.

 

I knew someone would say this after reading some of the other gas mileage threads and well, in this case.....you're wrong. Driving style doesn't vary enough to account for the increase. I've tried slowing down before and not going WOT any to get better mileage and it NEVER accounted for this much of an increase. BTW, 90% or so of the miles are highway and I can burn up two tanks of gas in a week just for work so I have a pretty damn good idea what type of mileage my car gets.