Thanks for your reply.
There is one more variable that I take into account is price per mile and here the diesel car get an advantage of almost 30% over the gas bike.
As stated, I would need to hit the 70 mpg barrier to make the bike as economical as the car.
Not to mention the bike requires much more maintenance and one that is a fair bit more expensive ...
Anyway, I think the least expensive will be to learn how to drive nice and slow rather than changing bike ...
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