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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Gasoline has more oomph than etanol. E85 gets lower mileage but is cheaper. For the most part, use what manufacturer suggest. It does vary though. I had a small tank and a 45 min commute so it was easy to test. tried 87, 91, speed limit, over somewhat - nothing made a difference so i used 87 octane at slightly above limit. When I replaced that car with a small truck (S10 with a 4cyl), mileage was about the same but performance difference was significant so I used 91.
My current car requires 91 minimum so its a no brainer. A co-worker has a truck that required 91 but he used 87 - right up until he needed the heads replaced because of extreme carbon build up on the valves.
My current car requires 91 minimum so its a no brainer. A co-worker has a truck that required 91 but he used 87 - right up until he needed the heads replaced because of extreme carbon build up on the valves.
