Anyone else notice their highway fuel economy is worse than City? My 2018 XLT 4WD can get 17 to 18 mpg in suburban driving on warm days, like up to 55 mph in moderate stop and go. It drops to 15 to 16 in the colder or snowy conditions . But once I get on the freeway where traffic is 70+mph the fuel economy doesn't increase and actually drops fairly dramatically I understand the SUVs are larger, heavier, with poor aerodynamics but the window sticker says up to 22 mpg highway. Are they considering 55 mph to be highway speeds? I am using the pencil and paper method of calculating gas mileage and am running the factory tires.