To an extent I agree with you, Avant. There's a simplistic mentality that a 1.0l engine will use half the fuel of a 2.0l and this is entirely false.
That said, trying to eek out economy out of a very large displacement engine strikes me as slightly perverse. You don't enjoy the benefit of the potential power and your economy is still below what you would get out of a smaller engine.
I think it's about picking an engine that's appropriately powered for your use. This is particularly applicable to diesels.
Marine users are terrified about idling their diesel engines for an extended period of time-because the engine just doesn't warm up properly at idle and there is a threat of bore glazing. If you think about it, a 250hp 3.0 turbo diesel is running at little more than idle for the vast majority of normal road driving. That makes me nervous.
At the other end of the spectrum you have people trying to wring out 90+ hp out of a 1.2 petrol. No road engine could sustain this power output for a long period of time without overheating critical components. If you look at car derived engines used for constant power eg the excellent VW 1.9 TDI, the rated outputs are very low.
As with many things, the middle road appears to offer the best compromise-but in a world of superlatives this 'boring' option often gets overlooked.
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