Quote:
Originally Posted by AeroMcAeroFace
Obviously a turbo allows more fuel into the engine, but does it make any difference to cruise MPG? The IMA presumably doesn't do anything at cruise, or maybe it does boost and while doing so allows the engine to go into lean burn.
Theoretically, ignoring that you have to accelerate, is a turbo insight going to get better or worse MPG at a constant speed cruise?
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Theoretically, a turbo will always improve mpg at a constant speed because more of the heat energy of the fuel is being utilised ie not so much wasted out of the exhaust. That more than outweighs increased back pressure.
But that's theoretical only. I've had both mpg gains and losses on different cars I have turbo'd.