first 2 years, accelerated uphill just fine, this past year somebody walking could beat it up the hill, had the vacuum checked, the timing belt etc replaced, did a tune up, when test driving other Mazda mvp they too seem to have an acceleration problem, dealer couldn't explain, i've started to stop other people driving the same car and yes they have acceleration problems and no, they have not figured out why either, can't find any info on Mazda site, talk to dealer, "well bring it in, we'll check it out", It seems to be a common problem which means they out to be able to say "Oh yeah, your bla bla bla needs replaced" So far I'm batting zero for getting to the root of the matter.