Why don’t you start with a real MPG test instead of guessing what you have - you mention idling, winging the motor, etc.
Top the tank, warm the motor up and go 30 or 40 miles sustained speed then top it off again.
I'm sure it will do better at highway cruise, and that is in the plan once we get some decent weather and aren't on stay-at-home lockdown... not sure the local authorities would consider Mopar cruising an essential activity
On the other hand, I would be plenty of distance from others except at the gas station!
Even if I'm off 50% which is really unlikely, that'd still be only 7 mpg.
What I really was looking for is other people's mpg with strokers and big cams
