What grade gas do you use?

[Thunder]

I use at least 89 in my 89K5 350. because I get a lot better gas milage. It acually costs more to run cheap regular because my gas mileage drops off so much. Also the owners manual says to run at least 87

Get out and Vote!

 

[Kelboski]

why is there a difference in the mileage when using one or the other?

 

[Emmettology 101]

I use 87(regular) and sometimes 89 (plus) in my Blazer, but I use 93-94 in my Probe which actually says on the filler door - "Use Premium Fuel Only!"...

I have always been told that the higher the octane the more it burns and the better the gas mileage. And that would equal into better combustion.

Mike

See <font color=green>EMMETT</font color=green> -&gt; http://emmett.coloradok5.com

 

[90K5]

I have to run premium because of my Hypertech chip. When I first got it I ran regualar and it didn't run very well but its better now. I've never noticed a change in mileage though, I get around 10 regardless of how I drive. I dont think it is ever any more of less.

90K5