Another thing to keep in mind is that the percent of driving in the city/highway may be different than someone else so your combined mpg will be different. For instance, my combined mpg using fueleconomy.gov's standard values (15,000 miles and 55% city driving) is 29. However, when I put in how many actual miles I drive (24,350), and that I do 25% city driving, that combined mpg jumps up to 32.
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