lemonlime

So what do you use in your car/truck?

Even though my car is designed or regular, it seems to run better on premium, so 91 octane it gets Plus I get 3x the points for free carwashes at esso, or extra air miles from shell.

fazes

premium on the stang...running at regular or a step up just has that slight delay when you punch it...I hate that

Chadxton

iTrader: (1)

Premium for me. I have to because my car is boosted.

Angus

Just regular.. tried premium a few times.. generally for whatever reason seems i get worse MPG on premium..

o its 95 yukon.. if that matters

Chadxton

iTrader: (1)

You may get worse mileage and lower performance on high octane gas if you have a lower compression engine.

Reason is because all the octane does is lower the volatility of the gas. The gas becomes more volatile with higher compression, meaning it can pre-ignite simply under compression before spark. Therefore we have detonation/pinging happening and the engine isn't happening.

So let's dispel one myth: High octane gas doesn't make for better performance.

Hardwrkr

iTrader: (5)

"So let's dispel one myth: High octane gas doesn't make for better performance."...

...in most engines that don't need a high octane fuel.

Chadxton

iTrader: (1)

^Right...

I missed that part.

JRace

Premium - 90 honda accord exr - gets wayyy beter gas milage than wit regular

Mid-grad in the toyata p/u...it just likes it better.

Hardcore Rock Superstar

iTrader: (2)

sadly the tbird requires premium....