Might as well revive this one... My beloved 1.0T Fiesta DD beater (yes, I really did love that car) was murdered by a deer two weeks ago so I went down to Tennessee to pick up the new daily. 2013 Golf TDI with 104k fresh off the emissions fix.
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This truck sucks fuel no matter what I do. 15mpg average for my 84 mile round trip almost all highway commute (70-80mph), 13mpg towing the empty trailer down to Nashville (75mph), and 11mpg towing the car back up to Ohio (80mph). I've found that it doesn't matter what speed I tow a loaded trailer with as the higher speeds allow it to stay locked up in 4th, so 80mph it is. I think it needs a good intake cleaning based off the junk I saw in there when I did the injectors coupled with the random misfire stumbles it gets once in a while.