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US patent #7677208. Crawling in traffic, the engine would run 5-10% of the time the vehicle was in that same traffic. It would only run at highest BSFC or not run at all.
Use any engine, or use and electric motor and a battery. The powertrain is the way to high efficiency, at least according to the EPA, Ford and the University of Michigan in their 2006 publication 80% improvement in fuel economy can be accomplished with powertrain configurations alone.
Add an engine designed to only run at best BSFC or not run (no throttle control), plus aerodynamics which lower overall demand, and LRR tires and you get to 120% improvement in mileage.
regards
Mech
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