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Several years ago, we had a summer intern college student here, that participated in his school's super-high mileage program.
He indicated that his entry in the field got well over 600 mpg by using a Briggs engine, which was operated under normal P&G methods.
Now picture a hybrid vehicle running steady state on the highway, and running off electric power. The gas engine is cycled on/off, and only run in it's BSFC mode of operation, with optimum thermal efficiency.
Throttle plate is probably set to 80% and engine rpm's are kept within a narrow range for minimum fuel consumption, with the sole purpose of charging the battery backup again when needed.
The above is why a properly designed hybrid will alway beat an ICE in similar driving conditions, especially when the ICE is continuously run at normal road load, i.e. with the throttle plate almost closed, and rpm's out of the BSFC regime.
Jim.
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