Well the prius would probably be doing around 80 mph at 30% engine load.
So not much of a comparison could be made.
It's just the wrong application.
Really about the only thing that could be done to improve fuel economy on a prius engine by a noticeable amount would be to rip out the gas motor and drop in a turbo diesel.
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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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