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Originally Posted by gbobla
Toyota chooses to advertise using the EPA #'s.
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AFIK, they are not allowed to use any other numbers by law.
EPA tests are done with no A/C and on a dyno in a lab, so there are huge discrepancies between what we may get and what they "get". Also they are using testing methods developed in the 60's and most people (even driving 'conservatively') do not drive like people did in the 60's.
I still say the biggest factor is that you are driving a fresh motor, whereas EPA tested a well broken-in motor, and that can make a huge difference, especially these days with computers in the vehicle that monitor mileage and adjust various things on the engine to ease it's break-in so that it will last longer. If after 8000 miles it's still getting low MPG, then you may have something to complain about.