bluesaint

When I had my RX7 (FD) I had an apex powerFC and came with a knock sensor value reader. From testing 91 gas from chevron, shell and 76, the order of highest (bad) knock reading to lowest was: 76, Chevron and Shell. So shell came with the least amount of knock in my little test. Be warned this was a single test, so could simply mean 76 or chevron just didn't have a great batch of gas at the time, so take it with a grain of salt.

thomsbrain

Costco works fine in every car I've ever driven. They add injector cleaner, just like all the other brands.

danvuquoc

I use 87 for daily use.

kaansahbaz

my ex tuner claimed 76 is the best

tbkonwso

there is so many variable that its hard to conclude, every station your ethanol content is going to be different depends on day. you will drive different, traffic will be different, temp will be different.

i fill up at Chevron because it looks clean and i like the blue logo.

whiteflash

A friend of mines old (89) mustang only pinged with Shell gas. Not that that's a scientific test in the least bit, but it's a personal enough story to get me to avoid Shell stations whenever possible. I fill up at Chevron 99% of the time because those are the stations next to my house and work.

Truth be told (even though I work for Chevron) I've always found/feel like I get just a tad more giddyup with 76 premium. I also lost MPG's (or maybe my right foot just got heavier).

Pretty much Chevron/76 only in my car if its by choice. If I'm stranded or near stranded, I'm not going to be picky over my brand of diluted gasoline.

rob-2

Chevron sells the Techron under license to shell who adds it to their gas, but in lesser volume than Chevron.

I normally buy the cheapest 91 oc available ($4.06 lately) and just add a techron fuel system cleaner every oil change.

iDashX

lilazngrl4o8

Chevron > 76 > Shell > Mobil. In that order if the preceding gas station isn't readily available.

I've noticed my cars in the past react differently to different gas.

My Audi drove far better (smoother, faster acceleration, no stutter/lag, smoother idle and better gas mileage) on 76 than it did on Chevron, only used the 2 brands.

My Accord, better gas mileage with Chevron than 76, car was too freaking slow to even notice a difference in speed lol. Only used the 2 brands as well.

S2k, I don't think I noticed the difference between Chevron or 76 in terms of mileage or performance. I used the 2 almost evenly. Whichever was cheaper and would change it up after a couple of fill ups. I never put Shell in it.

My BMW, seems to get slightly more miles out of a tank of Shell gas, but I've only used Shell like 3-5x. Performs best on Chevron. Mileage isn't as good with 76 and performance is the same as Chevron. It pulls the most with Chevron, accelerates quickly, drives smooth, idles smooth.

I once put Valero in the family mini van and it was crap. The car had terrible acceleration, lagged so bad and it couldn't accelerate. I drove around just burning the gas to get rid of it cause it was so crappy.

Thateguhate

What? I've always Put Mobil on a pedistol! No not really but I always used it on the way to/ and in LA. It's not available here locally.

I'm surprised nobody has mentioned AM/PM or Safeway gas. I hear safeway gas saves you big bucks but I've never used it myself.. I can't see it being too much different from Costco's gas considering they are close in price w/ the club card.