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Last weekend. Drove from Virginia to Houston Texas on Friday. Attended a race Saturday and Sunday. Then drove back on Monday. 1400 miles each way towing a 10,000+ lb trailer, doing 65-70 on the interstate, cruise control and A/C on.
I love this truck.
Can't wait to put some mods on it to try and get that number a little higher.
For those of you that have never used it, I used Howes Diesel treatment for a couple tank fulls and noticed a 1 to 1.5 mpg increase over the untreated tanks. I used to use the stuff years ago when I was driving a big truck OTR. Always had good results. So I bought a bottle when I was filling up one time, just to see how the 7.3 would like it. Can't argue with the results...