I have a 2022 with the 5.0 I average 14 in the city and 16-18 on the highway. I found the best milage is at 55-60 mph where I've gotten 20-21 mpg, these are all in standard mode. 87 octane. These guys burning premium fuel is crazy. 1.) the high octane is only needed in higher compression engines to eliminate detonation, which the standard 5.0 is not. 2.) Higher octane cost way more per gallon so what's the point? no savings there at all. You only need high octane if you supercharge this engine and then at that point you shouldn't care about milage because it gets terrible economy with the superchargers. I work in an auto test lab with all the OEM's and that's the facts. If you wanted better milage you should have gotten the 2.7 eco boost.