I have a 6. 7 ISB in my Freightliner M2 Propane Bobtail truck and I was wondering if anyone has tried propane injection with the 6. 7 with the DPF. Everywhere I go is up hill and we can all use more power and I have 3000 gals. of the stuff on back. I figure that It should run cleaner so it should be better for the DPF and better fuel milage would be another plus. Any input would be great. Thanks