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I wonder if by making more power I didn't need to downshift as much causing the slight uptick in economy.
As far as diesel engine economy goes, it is a combination of the higher compression and the higher amount of energy in diesel fuel. Direct gas injection engines can take advantage of the power of higher compression while still running gas. By being able to time the injection of the gasoline during high compression the engine is able to produce more horsepower while using less fuel.
I'd have to find it but there is an article about a 5 cylinder compression ignition engine that is under development in Europe that runs on pure ethanol. IIRC the compression ratio was 21:1, and it is extremely efficient.
While those newer engines may be a good improvement, I think the hydrogen fuel cell is going to be the future of transportation; probably not til I'm a grandfather, but there are a lot of good things going for it. Especially if we can start producing electricity with solar wind and nuclear power instead of burning fossils.
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 RIP Maxima 1997-2012
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Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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