premium, mid grade, or regular gas???

[George_Pimpdaddy]

hi i have a 89 blazer with a new rebuilt 350 and a 700 r4 and was wondering if running on premium or even mid grade gas is better for the engine or even power that would be noticable on a daily driver also what about gas milage does that go up with a higher octane gas??? i currently am running premium in my truck am i wasting money on the higher octane???
thanks for any info

 

[sled_dog]

blowing your money. It is ALWAYS best to run the LOWEST octane rating you can. You will make more power running the lowest Octane you can. If you can run it on regular and you run it on Premium you are hurting power.

 

[cbbr]

I agree, waste of money. Regular works just fine.

 

[George_Pimpdaddy]

thank you for your responses i guess ill be switching back to regular again

 

[jekquistk5]

The only way youll get more power out of a higher octane is to increase your compression. If you didn't do that on your rebuild your wastin money!

 

[sled_dog]

Can advance your timing as well, kind of pointless after a point though.

 

[Emmettology 101]

blowing your money. It is ALWAYS best to run the LOWEST octane rating you can. You will make more power running the lowest Octane you can. If you can run it on regular and you run it on Premium you are hurting power.

But in the past I have tried both and have gotten better MPG with Premium over regular... Not sure how cost effective it was though. I gained some MPG, but it also costs more.

 

[Eric M.]

I started running Prem. in all my rigs. I figured I was spending so much on gas as it was, what the heck. I noticed the vehicles without spark advance were not pinging as much and seemed to have a little more power (it wasn't much ... it may even have just been my imagination!). The vehicles with spark advance did have more power. I guess they weren't automatically retarding the timing when pinging happened since the higher octane fuel pinged less. I don't know about milage and I'm sure it isn't cost affective, but, I do it anyways.



Eric M.

 

[RustyMule]

Premium, due to 10:1 compression!