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Gramp34 efficiency however is only indirectly related to fuel consumpton, Lots of a fuels available energy is not converted in motive power. All forced air systems inproves engine efficiency, ie more motive power is gained from the fuel consumed. If you dont beleive look at the fuel consumption of a 100hp inline 6 clyinder and compare it to an equivalent modern lightweight 4 clyinder supercharged diesel ( say teh volvo KAD32p for example). The fact is that its not a simple energy in and out, its the conversion of calorific energy in the fuel to motive power thats whats been improved.
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