Hey guys/gals, I have a 2006 Jetta TDI with the 1.9 BRM engine. I purchased to car used (170,000miles) and initially would get 45-48 mpg depending on highway / city driving. It has slowly decreased to 40-42 mpg and now regularly gets 37-39 mpg. Car still performs well, I've recently changed the timing belt and fuel filter which made no difference. Any ideas where to begin camshaft, injectors etc... Car currently has 228,000 miles on it.