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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.
regards
Mech
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