"AWY ('90 Diesel)" I assume thats mine (btw, i use that site all the time, its great!)4147RPM :roll: no wonder.if i had an AUG (as crappy as they are) it would be 3863RPM, but that would be even worse acceleration.BTW, i just ordered a new fuel filter
There are a tremendous number of factors that can assist in producing poor fuel economy. Here is a non-exhaustive list: bad fuel, worn or improperly calibrated pump, improper pump or cam timing, old or improperly calibrated injectors, incorrect valve adjustment, improperly functioning hydraulic lifters, dirty air cleaner or other intake restriction, boost leak or pre-turbine exhaust leak on a TD, exhaust restriction, restriction in the fuel line, imbalanced or poor cylinder compression, worn accessory bearing such as alternator or a/c compressor, malfunctioning electrical system causing excessive drag on alternator, slipping clutch, improper transmission fluid or fluid level, worn or improperly lubed cv joints, worn or mis-adjusted wheel bearings, dragging brakes (which in turn can be caused by a variety of factors including but not limited to improper pedal freeplay adjustment, worn or corroded calipers, worn, dirty or corroded brake shoes, blockage in brake line, malfunctioning master or slave cylinder, malfunctioning brake booster), improperly balanced or improper tires, poor driving habits.Andrew