Fuel mileage at elevation

[B. Everett]

We are going to Reno for the fireworks 500. I googled fuel mileage at higher elevations and I found contrary Information. Is there much of a change in fuel mileage at higher elevations compared to sea level. By the way the car is a class 12 fat motor with a plenum. Thanks

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[manicmechanic]

Modern fuel injection will only put in enough fuel to burn the available air "O2". Non feedback engines will run richer at higher altitude therefor poorer mileage.

[B. Everett]

I understand the concept. I guess my question is if I jet the car to a near perfect air fuel ratio. Would the engine get worse mileage because the air is thinner, even though I compensated with a leaner fuel jet. If there is any change it would be minimal and I understand that. It's not important, just something I was scratching my head over.

[manicmechanic]

For fuel mileage I am thinking it will be near the same allowing air fuel ratio is the same. Peak horsepower will be reduced as if you had a smaller carb or intake system.Yup good head scratcher.
Best of luck for the race!.

[D-rek]

The motor is going to use the same amount of fuel but because the motor will be down on hp forcing you to drive it harder which would reduce mileage A little off topic but plenums are tough to deal with at altitude. My 12 car was I constant jetting battle.