v10 torque vrs diesel

Just finished my mountain trip with the 340 ISB Cummins and when comparing to the previous gas coach (as in my earlier post in this thread) I did find it slower ( rarely tried to pass anyone on a 2-lane road) but all-in-all, it performed well. Pulling uphill (no tow vehicle) I could definitely tell the difference between the two - the former able to increase speed on a hill, albeit by downshifting to a lower gear automatically. The ISB would not downshift under 4th gear normally, even when floored. Bit lacking in the efficiency department (averaged 6.95 mpg whereas the 7.4 L Vortec got me 7-7.5 hwy and 9-9.5 in the mountains or about 8 avg). Somehow, I had expected about 8 or 9 mpg with the ISB, but not necessarily disappointed with that. The most important thing is that it was a successful trip with no mechanical failures and a wonderful time was had by all!