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My built-in 4runner mpg gauge always reads much more optomistic mpg than I actually record when I do the math to make an entry in my fuel log. Usually it's in the 2.5-3mpg range.
I have noticed that it is way more off on city driving than highway driving. On a recent highway only road trip my mpg gauge was only off by about .5 mpg. Usually on my 90% city/10% highway tanks it's off by as much as 3 mpg!
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