Quote:
Originally Posted by freebeard
How and why?
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Explained above. Throttle by wire combined with O2 sensors and MAP/MAF sensors means the car adjusts fueling rate to compensate for the reduced air density.
Carbs don't compensate. They are calibrated for a particular air density and do not change.
Diesels should get better fuel economy due to reduced aerodynamic drag so long as the turbo is feeding enough air to burn all the fuel. If it's rollin coal, then it's wasting fuel.