what gas do you run?

[big83chevy4x4]

i have to run 92 in my truck, it diesels otherwise. i get better mileage with the premium also.

 

[gotchevys?]

gas

I run premiem in my 70 big block but in my 350 tbi 89 sub i run 87

 

[anjieandjohn]

run 87 octane and get around 13 mpg in town and 18 on the highway at 75 mph.

 

[guido666]

Actually, I can only run 94. 93 from some stations will work.

 

[k20]

Premium is 93 around here, thats what I run

 

[big94gmc]

Gas is gas. It burns. My truck drives. I use regular. There's no difference whatsoever if I run 87 or 92, and if there were, it'd be so minute that the extra mileage wouldn't offset of extra cost of the higher grade. Gas goes in, fumes come out, no matter what you put in the tank.

But, on a sad note, the big Freightliner gets better gas mileage then the GMC - even when loaded down!

 

[Chaddy]

I run 87 but I put the earnhart octane boost in there everytime I fill up. No pings

 

[sandawgk5]

I run 87 as per the owners manual. Plus it is down to $2.50 here in the Communist State of Kalifornia.

Ira

 

[gjk5]

I run regular, which is 85 here in my K5 and '99 Tahoe, no issues with either.

 

[cbbr]

Whatever is cheapest - 87 octaine does just fine.

 

[bluehen]

I have a chip from tbichips.com so I run premium. It seems to have gotten me 1.75-2mpg

 

[Beast388]

In the Burb I run 93 octane but in everything else I use the 89 octane ethanol blend. The blend is usually cheaper and supports the local farmers.

 

[barneybasher1010]

cheapest stuff around 87 octane

 

[JK5]

Sunoco Ultra 94 makes my rig rip...my 10:1 motor needs at least 92.

 

[randy88k5]

I run 87 in the Blazer, and carry around Lucas Octane Boost incase I want to bump the chip and have some fun...

 

[350k5]

I use 87, I don't see enough benifit running a higher octane to justify paying the extra price.

 

[monster man]

87

in fact, 92 makes most of my vehicles misfire something terrible. I only have 70's low compression smog monsters

 

[B_to_C]

Ummm, can't vote. I run regular which is 85 octane around here

 

[4xcrazy]

Cheapest possible,,,,,with a truck getting 10 gallons per mile,,,

 

[Smitty]

I run 93 in the '56 but 87 in the other three vehicles. They actually had a service bulletin come out on my Ford saying not to run above 89. I checked the mpg with the different octane ratings on the Ford and there was no difference so I follow the money line....