Do you get better mileage with certain gas?

[NWSub]

do you think you get better mileage with certain brands of gas??

[scoobydoo2]

...nope!

[grossgary]

i've never noticed and hard to imagine unless you were really refined and anal in your driving habits being 100% repeatable, etc.

*if* gas did cause variation in gas mileage i would assume it could vary wildly, like an indeterminate differential equation.....meaning for some vehicles it does make a difference based on engine type, engine condition, others it doesn't.....and then in some cases it might not make a difference and others it might...like city verses highway, flat land verses highway, towing or hauling heavy loads, heavy go pedal foot or not, big brake user...etc.

[nipper]

I can get worse mileage if i go to BJ's Wholesale club or use some off brand gas.

[DrCloud]

Originally Posted by grossgary

i've never noticed and hard to imagine unless you were really refined and anal in your driving habits being 100% repeatable, etc.

*if* gas did cause variation in gas mileage i would assume it could vary wildly, like an indeterminate differential equation.....meaning for some vehicles it does make a difference based on engine type, engine condition, others it doesn't.....and then in some cases it might not make a difference and others it might...like city verses highway, flat land verses highway, towing or hauling heavy loads, heavy go pedal foot or not, big brake user...etc.

Oh, c'mon. Differential equation -- give me a break.

Crappy, discount gas (irrespective of grade) is unreliable, the big-ticket national brands less so. Saving a few pennies a gallon, particularly for the more sensitive drive trains (and I'm talking about the XT ones here) just isn't worth it. This isn't an MPG issue so much as it's a crud-in-your-system issue.

Just buy good-quality gas, and you won't have to worry about this stuff. HPH

[rasterman]

Agree. I had to fire my old favorite cheap generic gas station when I got the XT. My '98 never seemed to mind but the new one always runs better and shows a slight MPG boost on the oil co. branded gas.

[DrCloud]

^ Thank you.

One of the pleasures of driving rental cars is buying the cheapest gas I can find and not worrying about the consequences.

But I don't do that with cars I own. And my wife has been trained to buy only quality gas for her OBXT. (My tuned LGT-B is truly finicky indeed. Fortunately, we have 93 octane here at sea level.) HPH

[AWDFTW]

Seeing as I only buy "name brand" gas from stations that stay busy....nope.

Kaylee prefers pure gas when I can find it, but it is very rare.

[grossgary]

Originally Posted by DrCloud

Oh, c'mon. Differential equation -- give me a break.

that was a joke, was making fun of the idea...hence the "*if*" at the beginning of my comment. should have added a

that being said i don't do the cheap gas outlets either. i have seen significant mileage reduction at one place. was super cheap and so it attracted business. back alley, sold nothing but gas (that should be a sign), and was very sloppy looking area/place. my grandmother frequented the place until we talked her out of it.

[jp1203]

I'm starting to wonder about this with my 2008. I'm getting 17.1 MPG. It could be due to the extreme cold, my heavy foot, and my use of sport sharp mode a little too often, but I don't think I ever saw less than 18.5 in weather like this with my 2004.

I've always just run whatever 93 Octane gas I happened to be close to, but maybe the 2004 was a little less picky. I think I'll try Sunoco or Shell 93 next fillup to see if there's any change.