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I currently drive a 1985 1.6na VW. And even if I drive the $#!+ out of it I get 47mpg. If I practice some good driving habits ( and mostly highway) I can easily get 50+. The most efficient my car can get is 265g/kwh. The tdi's best fuel efficiency is 200g/kwh so with all things being equal the the tdi's could get 66... without even trying.
But on the other hand you should consider maintenance, if your trying to save money tdi's can be very expensive to maintain. A 600 dollar timing belt change every 60k isn't unheard of.... and with interference engines the scheduled maintenance is manditory.
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