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2) The trees will thank you for choosing gas (cleaner emissions because with the high sulfur content of north american diesel fuel, can't use all the normal emission controlling stuff)
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The supposidly cleaner emmisions thing is a tricky issue. Diesel does produce more dirty stuff, but fewer emmisions that are harmful the the enviroment. But you're also using about 1/2 the fuel, that cant be bad. Get the one that you like. The tdi is incredibly practical, even more so in the golf with tons of cargo room. But you can't deny that the 1.8t is a lot of fun too.