I may be wrong, but my experience is that the ALDA does not affect MPG. It's your right foot that does.

Also, on the VWs, the auto trans for Jettas, Golfs, Passats from 2000 to 2004 are the ones that are trash. TDIclub says that this tranny must be replaced - it cannot be rebuilt. They say that members there are replacing the auto with 5 -spd: cost in the neighborhood of $3K to do it, according to sources.

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1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed