This Just In... All 2008's must run PREMIUM!

[DRTYFN]

Originally Posted by imwoblin

My 07 Escalade "recommends" the use of premium unleaded (owners manual). Since the H2 uses the same 6.2 as the Caddy, it would make sense to recommend premium unleaded.

But it's slightly detuned.
I guess I'll be waiting for the new H1.

[jmsspratlin]

[Tex_h2]

For 11 years I ran 93 octane in my truck, and now with a jet chip I still run 93 octane..(actaully have to) Some say it doesn't matter, some say it does....I think it does matter.....

[Agriv8r]

Originally Posted by Tex_h2

For 11 years I ran 93 octane in my truck, and now with a jet chip I still run 93 octane..(actaully have to) Some say it doesn't matter, some say it does....I think it does matter.....

if you dont change it how do you know....

[Tex_h2]

Originally Posted by Agriv8r

if you dont change it how do you know....

I have used reg, every now and then and noticed a lag or decrease in power

[CovertH2]

The Diablo Predator programmer has a program for 87 octane, just ran it into my '08 two days ago, runs fine. Prior to that no issues ever running on unleaded. FYI.

[Little General]

I got 3000+ miles on my 08 and have run 93 since new. Found out the other day that the dealer puts 87 in for the free tank with purchase because of the cost. On top of that , this is the first new car I have ever bought that did not include the first oil change free. I read it is the same +/- engine as the corvette and all corvettes come with Mobil 1 from the factory, H2's come with dino. Since I had to do my first oil change at my cost, I put Mobil 1 in mine. I will report if mpg's change.