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To keep the engine temp up keep an insulated blanket handy during stops. Using alternator power to produce hydrogen and oxygen is not very efficient. Using water / alcohol injection in a higher compression engine is a proven way to reduce pre-ignition. So far we have seen essentially stock engines. Super tuned 50cc engines such as the MotoID Ruckus project could produce enough power but would run at high rpm. The old record of 472 mpg was set by a Honda 125cc increased to 185cc.
The Hayes Diesel was advertised once at $19-20k; compare to the gas version. I did price a 900cc 3 cyl. Kubota diesel and the dealer quoted $1800. At some point the quest for 500 mpg will be met; the question will be, "Will the machine be an every day commuter?" Anyone for a winterized PCX 150? Expect some 125cc 6 speed bikes with lowered clip-on bars and a full body shell.
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