Idle consumption numbers will vary greatly depending on any accessories that are running at the time. My 02 Insight was .11 GPH. Most 4 cylinder engines will be in the .15 to .25 range, while a large V8 will be .5 GPH or even higher. I told someone once that my Insight used the same amount of fuel going 40 MPH and his V8 used just sitting there running with no accessory loads.
I drove close to 200 miles today to pick up a 2 ton AC coil to replace one that was stolen. Temps were in the low 30s. The gauge said 49.3 MPG when I got home. I used no accessories, NOT EVEN THE HEATER. The unit fit in the back of my Fiesta with less than 2 inches clearance. Saved close to $1000 and still got the same warranty as a new unit. I would have been lucky to get 2 more MPG in summertime, thanks to my grille block.
regards
Mech
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