Gas?

[Hamr25]

Just wondering what you all run? 87 (Cheapskate!), 89, 91-93, race gas?.

I just filled up with some 91 on base and i noticed my low end knock is gone and i am averaging like 20mpg as opposed to my 15-17.9.

[MadmikeX3]

I have an old jeep and a big V8 So i just run the Lowest grade gas but I do GUNK carb and gas cleaner every two or three tanks.

[socalkenny]

The cheaper the better.

[tickwomp]

I was reading tha manual that came with our commander, and it says DO NOT use anything about 87 octane with the v6 abd 89 octane with the v8. I can't imagine why, though. I always thought the higher octane the better.

[mjk]

cheap stuff

[HillBillE]

Both my XJ and '02 F150 run better/get better milage on the 87 octane.

My XJ ('99) the 'check engine' light comes on if I run 89 or higher!

On my CJ, I get a bit better milage running 91 octane Non-oxygenated fuel, but the cost isn't worth the gain, and not all stations carry the non-oxygenated fuel.

[notarubicon]

if it doesnt say to run higher octane in your vehicle then you really shouldnt there is no real added benefit and you dont get a complete burn when it ignites causing gunk build up

[tickwomp]

My BMW 335i ran 93 octane at the lowest. It would tolerate 91 octane, but the engine would retard.

[Jeffb_79]

87.
That's what the engine was made for, that's what I run.
If someone out there is getting 3.5-5MPG increases running a step higher in octane with no tuning.... I call shenanigans.

[MadmikeX3]

If someone out there is getting 3.5-5MPG increases running a step higher in octane with no tuning.... I call shenanigans.

In my 240sx I was able to get a total 50-60 more miles per tank when i stepped up to 93. Only other upgrade was from Bosh platinum's to NGK platinum's.