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Nascar is also using a racing fuel with a lower air-fuel ratio, so they can make more power with less air.


Just like E85, it likes a ~10:1 air fuel ratio (for good E85), but like propane, has higher octane and less energy than gas. Differnece is, it requies less air to completely burn, so you can make LOTS of power on E85, but you will burn LOTS of fuel in the process.


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