About my 99 F350
99' F350 XLT Superduty Supercab, 6 speed with the original clutch, 67K miles on the 7.3 Tubro Diesel (Banks Stinger Kit installed at 11K) I use smaller tires when towing my 30' 5th wheel (235 inplace of the 265) to get the RPM's up to 2,000 @ 67 MPH. Towing we get 11-12 MPG and...