2.7EB Fuel Economy

Howdy all.

Just bought a 2018 F150 2.7EB SuperCrew with the 5 ft bed. Did about 90 miles on the highway yesterday (70-75 mph) and I’m only averaging about 17 mpg on 88 octane gas and in eco mode. Is this pretty normal given my alterations?

I’m assuming these all play a factor:

• leveled in front
• leer xr100 bed topper
• 275/70r18 duratracs