Hey everyone. I Usually get 10.5/ 11.5 on avg running on regular gas 2012 hemi 5.7. I just had my oil change with synthetic which I Usually do but I filled my car up with 89 plus gas as regular was sold out. I'm getting an avg of 6.1 3.1 and other random numbers. I reset it and it will go up to 10.5 then drop and stay at 6.2. Anyone know if changing the gas or oil makes a difference. Does it have to re calibrate by itself.
How much of a lead foot are you? Unless you idle more than you drive those numbers are horrible... To answer your question though it will figure out what octane is in it pretty much right away. The oil really has nothing to do with it unless you went from sludge to clean oil.
Thought about that but 6.1 liters/100 km would be 38 mpg which is unlikely. Also not many other countries use PON (from the mention of 89 that sounds like regular is 87) which also puts him below 4,000 feet. Also imperial gallons would give better MPG, not worse.
So my money would be on a northern US location in a major city, is parked outside, and has a remote starter.
ps if misfiring I wonder if he got some water in the gas from a little used pump.