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Again, it's not possible.
At idle my Jeep shows about a 0.5-0.7 gallon per hour fuel flow rate (depending if the compressor is engaged or not). ANY throttle input raises the fuel flow rate from there (it eats around 4.5 gal/hr at 75 mph). Now, if you were to say you get horrible mileage sitting at idle, I'd agree, because you are traveling zero miles. But the Jeep does not magically dump more gas in at idle than it does when traveling down the road, thru a parking lot, over some rocks, or down a rutted up mud pit.
I've left my Jeep idling litterally for hours when buried in the snow. It was around 0 F and we were taking turns shoveling and getting warm, so the Jeep stayed on for probably the better part of 3 hours. Didn't use much gas at all.
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