As a general rule of the several cars I have owned (with instrumentation), only the 2002 Insight was close to accurate enough to trust. I once drove 650 plus miles on a little over 9.6 gallons of fuel.
The guage read 70.2 MPG and the fill showed it to be 70.18.
Every other car was optomistic by 2 plus MPG. The wifes Sorento, my 08 Altima Coupe and my current 2011 Ford Fiesta all were-are in the 2.5 MPG optomistic range. If I remember right the wifes 09 Rogue was somewhat closer but still optomistic.
regards
Mech
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