Well maybe diesel is diesel is diesel but..... The two trips I've made east with my 2010 Cummins, I started in ND at about 17 mpg. From there the mileage steadily increased. By the time I hit Ohio I was up to about 21 mpg. On the return trip by the time I got back to ND I was back to 17 mpg again. Both times. All numbers from the onboard display.

shruggy

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".