You don't need to to anything fancy like varying the compression ratio. Simply operate the engine as close as possible to wide-open-throttle at all times, which eliminates the throttling losses. Contrary to popular belief, high vacuum (aka low manifold air pressure) does not actually translate to high efficiency. This is the reason a number of strategies to improve fuel efficiency work. For example:
Smaller engines in the same vehicle tend to get better gas mileage, because they operate closer to WOT.
Taller final drive ratios get better mileage, because they require higher engine torque (higher MAP) under the same conditions than a shorter (numerically higher) axle ratio.
The engines on hybrid vehicles spend much of their time at wide open throttle, storing energy for future use.
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