I vote for 10:1 for VHR builds.
Greater efficiency in everything, better fuel mileage... drives nicer, more power out of fuel system and turbo system of choice...
Now I dont know if I would try to run 800rwhp with 10:1 on 93 octane. It could probably be done but I dont see the point in that.
But if you could deal with maybe 550-600 on pump, and 800 on E85, I see no reason to take away from the motor with lower compression. Possibly do a E98 tune for kill mode.
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