I am debating if i should stick to my IDI and get a slide in camler or if I should get a motorhome. With my current, light weight, less tall camper, I get around 10 city/14hwy (maybe a bit better since I replaced the air filter). Motorhomes like I'm considering would be much roomier and ve fully self contained, but they have the massive 454 Chevy gasser, getting around half of the mpg of my current setup. When I was pulling a not very tall 27ft travel trailer, I was getting around 10mpg hwy but omg it was a slug, especially in wind. With a headwind one day, I could barely stay at 50mph on a fairly flat stretch of highway. Mpg does matter more than speed to me however, so I was wondering what mpgs slide in owners see. Doing the math, 12mpg at diesel prices still beats 7.5mpg at gas prices, potentially by $8 per 100 miles (assuming $2.50 for gas vs $3 for diesel). Assuming a 3 speed C6 IDI NA F250 would get 12mpg with a slide in.