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
2014 K&K 20ft landscape trailer
2013 x739 4x4 with 54in HC deck / 60in HD Broom
2015 John deere z930R 54in deck