New Chevy 6.0L gasser -- Octane?
Just bought the new Chevy 2500HD with 6.0L gas ... and wondering what you guys run for octane. And why you choose it? -- The 'why' is important too ... because it's not just about mpg, it's about ...
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I think they run fine on 87 octane. If I remember correctly, that is what GMC recommends. That being said, if you can by 91 octane that is ethanol free, you will probably get better mileage simply because it doesn't have to make popcorn too...
