I was just discussing this issue last night with the Warden while waiting for the AAA tow truck for another vehicle, not my RAM19!!!
(Warden= other half, she likes that name as we call her it around the house cause she gets strict about her household and abiding her rules!!!)lmao!!!
I actually let it idle for an hour enjoying the A/C and the mileage went down 30 miles. Figured I would check it out now and have crude baseline for when I travel from Fla to Pa. I stop at rest areas and may catnap 2-3 hours. Too short a time to get a hotel room and one of the reasons I really appreciate the big back seat to lay down!!! (I do crack open the windows)
Idle 48
Drive 123
Total 171
3,454 miles total (3 months)
In the beginning I was in my truck all the time sitting in driveway enjoying the new vehicle(Florida driveway equals A/C blasted). Then times at the beach when too hot...in truck idling enjoying scenery, mornings in truck idling enjoying heated seats (yeah I know Florida...chronic back issues), so I know why my idling is up there.
I never really paid this much attention in the past vehicles but watching that mileage drop in the RAM19 made me curious. That would be 2-3 gallons of fuel burning per hour correct, depending on your MPG???
(Mine said 12.6MPG)
I don't know if it burns off differently at idle versus running if that makes sense. Either way love my RAM19!!!