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The OEMs appear to be more interested in horsepower numbers than MPG numbers.
Max fuel economy is had with lean burn, but the epa has determined that NOx is the root of all evil and doesn't allow lean burn cars to be sold in the US.
The computer has to produce the cleanest emissions. Fuel economy is somewhere down the list.
There's not a whole lot than can be done for the engine but there is plenty that can be done for the rest of the vehicle.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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