I drove a Dodge/Cummins powered ambulance a couple of years ago, it was one we rented to supplement our stable of rigs during the Sturgis motorcycle Rally. All I can say is AWESOME. We regularly use the ford econolines and they do fine, but really suck out on the interstate, seems like every hill you lose everything, there have been many a time we have been busting our ass running down interstate (speed limit is 75 on interstate here) and we can barely hold 70 or 75, and of course there are people galore passing us as we are trying to get to the hospital doing a code or trauma. That dodge, didn't have quite the zip off the line but you could push her to whatever speed you needed on interstate and hold it without a problem. Sure would love to have one full time.