I bought a new 2022 lariat 502a with the 5.0 and 3.73 gears yesterday and on my 200km drive home I got 15L/100 which is about 15.5 mpg. There was a strong south wing which probably hurt it a fair bit. cruise was set at 120km (74mph). rpm's stayed at 1800-1900 which I thought was a little high.