The factory mpg meter on my Jeep is usually off by about 1 - 1.5 mpg in either direction at the end of a tank, so I don't trust it. However, the one in my Mom's 99 Grand Cherokee is within 0.5 mpg (usually closer) every time (computer avg vs hand calc avg).
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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