Apparently I found a Sunoco near campus that sells gas for quite cheap and couldn't help but notice that they also offer their Ultra 94 Octane line of gas too. I am not looking for OMG HAI OCTANE HP LVL+, but just curious on how it runs on our cars. Has anyone tried it?

 

I'm sure it would run fine, but using higher than necessary/spec'd octane fuel for street driving is just a waste of money.

 

I've always used Sunoco or Shell but I'm sure there really isn't a difference between 91-94.

But, I tend to get better gas mileage with Shell V-Power than Sunoco ULTRA.

 

QuikTrip has the best gas. Some guys here went around with an ethanol tester to see the different qualities of gas and QuikTrip always had the lowest ethanol percentages at 7-8%. Some other places had as much as 15% ethanol in their gas even though they're only supposed to have 10%. Less ethanol means more power and better gas mileage.

Anything over 91 octane is a waste for street driving, and even then going to race gas for track events is pretty useless unless you're boosted.

 

Not asking about the performance benefits (or lack of) from running Ultra 94, or other gases. Just asking how it runs on the RX-8.

I know a bunch of RX-7 guys that swear by Ultra 94, but they were all tuned on it.

 

like the others said, anything over the recommended (read :TUNE) fuel means waste of money.

this is why I fuel up with 91 most of the time, some gas station offer this, like Gulf, Some Sunoco, Getty, never seen it at Mobil/Shell/BP

sometimes I just go 89, cuz there is no reason to go high octane during winter months.

 

I use it all the time.

I'm FI sooo maybe it's just more piece of mind ... but unscientifically I believe the car runs better.

just say'n