Question about MPG

I love the Raptor, I’m strongly considering it, but the MPG does bother me. I’m reading 13-15 for the 3.5 TT? Is that about right? I don’t know why but I expected better efficiency out of that engine. Is this about what y’all get? Are there any mods you’ve done that bump that up some? I know mpg is probably not high on the list of concerns for many Raptor fans but I drive a lot and it’s def something I’ll have to consider.