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I'm sure you already know that you need to make sure that your timing belt is in good shape or it will destroy your engine.
adjusting the injector pump timing is pretty easy but there are also special tools that make it really accurate and easier.
Making sure that your fuel filter is clean is also important, even more so if you use any amount of bio-diesel, as it will loosen the crud up in the fuel system and clog the filter.
pulling the belt on the A/C will help with your mileage, then come summer re-install it.
The brakes and wheel bearings on the VW's are a bit fussy and should be checked for drag.
Make sure you have the narrower wheels for the diesel as they are also lighter weight, if you can find narrow light weight 14" wheels then you could get Honda Insight stock tires that are light and low rolling resistance, but they no longer make any LRR tires in 13" that I have been able to find.
It also might be time to change the transmission gear oil, it's GL-5 if I remember correctly.
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