I have essentially the same truck: Platinum trim and 5.5' bed with a tonneau, 3.5EB, max tow.. My mileage matches yours: 15-16 to and from work, which is about 50% city stop-and-go driving. A high of 18.7 on mostly highway at 55-60 mph. Drops precipitously if I drive faster. It is what it is.I usually calculate using Imperial Measurements. Was getting a pretty consistent 20.5-21 Imperial MPG+, but with cooler weather, it has dropped. The worst has been 15.5 L/100 kilometers, around 18.2 mpg Imperial, which is about 15.2 MPG in US gallon conversion. The best has been about 13 liters/ 100 km which converts to about 18.1 MPG U.S Gallon, or 21.7 Imperial.
My average is usually around 13.4 l/100 km, 17.6 MPG US/ or 21.0 Imperial MPG. I think I am doing pretty good if I can keep it above 20 imperial MPG.
I have a 2018 F150 3.5 Ecoboost, Supercrew, 302A 4X4 Sport with the 6.5 foot box, maxtow pkg. It is 100% stock with the LT275/65R18 tires. It has the 3.55 gears
From Saskatchewan Canada, not much elevation changes, around 2000 (+- 100) feet above sea level
not sure how most of you seem to get better fuel economy south of the border. All my calculations have been empty, haven't towed anything yet or hauled anything more than an ATV in the box.
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