Is my mpg reasonable?

My '03 with the 5.4 engine gets 16 mpg combined. At least that's what the computer says. Seems about right.

That seems low. My '22 gets about 21mpg at about 75mph (I do a LOT of interstate driving). When I'm home I get about 15mpg around town. You've owned this '21 for about a month, so I'm assuming you bought it used? Did the previous owner make any upgrades you may not know about?

It takes a long time to break in these. All the moving parts with low miles on this vehicle is causing drag from the brakes rubbing the disc to the gearbox being so tight. The engine and the attached accessories is still factory tight all the way back to the differential. Take it on a long drive of at least 500 miles of mixed driving and that should help loosen up the truck. Being an old school type I still "break in" a new vehicle which means lower rpm's and reduced top speed for the first 500 to 1,000 miles, no max performance take offs and no hard braking. Don't use cruise control during this period, you want the engine at varying speeds until it's broke in. Good luck! BTW, My 21 Platinum 4x4, HD tow ranges from 12 city to 21 highway with 4k on the clock.

My wife's 18 max platinum, 4x4, hd tow gets 17mpg. Some long stops here and there but mostly free flowing roads here in coastal GA.

I tease her all the time since I get 19.5 in my 2020 powerstroke

Plugs, Plugs...did I say plugs. Replace them. Check out the gap on the ones you pulled out, I will bet they are WAY off.

My 19 gets the same mpg as my 07 Navigator did City. 12 mpg....

My 2018 Max with HD Tow is clocking in at 18.1 over the last 44,000 miles. This is hand calculated and not the onboard computer which is about .9 mpg optimistic. I use 93 octane 95 percent of the time, and this is a mix of city/hwy driving with my work commute being about 20 miles of mostly hwy.

I just took a 1000 miles road trip and I got around 23 mpg average. New plugs, new air filter, new oil change and I drove around 70-75 mph. I got around 520 miles on a full tank when I filled up.

keny01998 said:

I just took a 1000 miles road trip and I got around 23 mpg average. New plugs, new air filter, new oil change and I drove around 70-75 mph. I got around 520 miles on a full tank when I filled up.

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I got the same from Macon, Ga to Jacksonville, Fl., lightly loaded and a tail wind. I set the cruise on 70 the entire distance. I used 93 octane.

I have had 2 expeditions now and mpg has been pretty consistent with both. Most of our driving is short trips in town and doing that the mileage is not great 12-15 but usually more in the 12-13 range. These are not great at short trips around town. MPG has been the same for both I have owned around town.

Thus far my new 2020 seems to get slightly worse mpg on the highway and towing, this is hard to scientifically quantify due to all sorts of external factors but I seem to be consistently about 1mpg less in the 2020 on the highway. I only have about 3k miles on the 2020 so it is hardly enough to make any sort of statement on it. We may still be running winter gas for most of that too.

I will say that I for sure have seen better mpg when using premium gas than lower octane, especially when towing and on long highway runs.

I should follow @LokiWolf advise and replace my plugs with something better. I was about to do that on my 2019 before it was no more.