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I have noticed a difference in mileage at different altitudes in my Gas hybrid.
I live and do most of my driving around 5000 ft above sealevel.
On a recent trip to Nevada, I noticed the mileage increased 10-15%. Only change was lower altitude.
This may depend on how the car map changes by altitude.
Short of adding a turbocharger or a supercharger, there is only so much that can be done to improve efficency at higher altitudes.
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