I only get 18-19 out of my 2.7. I drive 90% highway to and from work and it is a 27 mile one way drive. I expected better. I do drive 75ish mph. Would slowing down be that much better?

I do not have a lift and I have a tonnue cover on the bed.


2000 Ext Cab SR5 4WD 2.7L 5-speed.