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Old 07-21-2012, 03:53 PM   #25 (permalink)
High Mileage Lover
Join Date: Jul 2012
Location: Albuquerque, NM
Posts: 82

Sophia - '13 Fiat 500
Thanks: 29
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Talking MPG sensor

Originally Posted by Old Mechanic View Post
A 2.5 liter 4 cylinder engine uses about .25 gallon of fuel idling. My 02 Insight (1 liter 3 cyl) used .11 GPH idling. Your Toyota probably uses between .15 and .20 GPH while coasting in neutral with the engine running as long as you do not have the AC on.

If you are coasting at 60 MPH and using .2 GPH then your mileage in that instant is 60/.2 or 300 MPG. That will bring your average back up very quickly.

I usually keep my sensor set at "avg. mpg" and not "mpg" but when I've peaked while coasting or driving super efficiently I've seen it read 99.9 but I think that's as high as it can handle. :-)

I love my cute Fiat 500, Sophia!
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