With a start-stop system (performing like a kill-switch, but all automatically) the inner-city mileage would be not so much unfavorable comparing to the hybrid driveline.
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Originally Posted by payne171
Another thought is a 2 cycle. VERY efficient from a power to weight ratio standpoint, and direct injection advances could make it less polluting and more fuel efficient.
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I'm also favorable to 2-stroke engines due to their lighter and more compact design.