Yep, Ford had to put really big tanks on even the F150 to make up for the horrid mileage. Even with a 36 gallon tank, when towing with an F150 you might only get 300 miles. It's one reason the Lightning had problems selling as many as they wanted (aside from the ridiculous pricing the first year or so). Most people who are serious about towing don't use an F150 anyway, but that doesn't mean that F150 buyers don't fantasize about their potential towing needs in the future.