Check your tires/air pressure......Your could be dropping because of fuel additives, there was a post on here not to long ago for fuel additives for the diesel model. Basically said do not put anything in the gas tank especially sea foam, those additives are not meant for our type of diesel engine. Oil quality could be a factor, wheel alignment, balancing, etc etc......keep your car clean and waxed, try doing your own mpg with fuelly, I found out a while ago the mpg on cars is never accurate really.
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+1 for Merc6, I buy my diesel from one station, I use BP and get great mpg. I tried exxon for a month and all I got was crap.
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