I run 91 no ethonal in everything 1500 5.9L. I averaged around 10mpg I spent a good 20%. Thats daily driver also I didn't add truck fuel in my taxes because it would have been so hard to figure mileage.
1997 Ram 1500
2005 Ram 2500 HO Cummins
1997 Wells Cargo 6x12 enclosed trailer
2014 K&K 20ft landscape trailer
2013 x739 4x4 with 54in HC deck / 60in HD Broom
2010 Toro Grandstand 48in