Looking to change my a6 1.9 tdi (130) to an a4 that is newer and preferably quattro. I live in a rural area on top of a hill lol. I'd like at least the same economy as my a6 if not better. (38mpg) A tall order I guess but I think I've settled for either the 2.0 170 tdi or the newer 177 bhp version. On my budget I can get a fairly low milege 170 engine at around (55k ) or the newer engine with 90k or so. Any advice on which one might be be better option would be hugely appreciated. Thanks.