The overheating is an issue, but if you keep it above 2000 RPM like the manual says it seems to be OK. I try to judge if I am going up for a short time or a long time and shift accordingly. I discovered it quick when I blew the radiator hose on the drive home, gave me time to read the manuals. Just got back from the RV wash, first time I have seen it this clean
, uphill the whole way home, but I just let it fester in eco-mode as it's a short trip.
I did finally find the chassis manuals online thanks to someone here, I am now on a search for all the manuals that did and didn't come with the RV for all the devices inside. If there is a place on this forum I'll upload them there when I have them collected.
So the 400 gets the same MPG? I always thought I should stay on as small an engine as I could, but I am probably killing my MPG by flooring it all the time and flooding the turbo with diesel to burn. If it had more horses it would be less at the edge of it's capabilities all the time. Of course, much of it is the climbing the Rockies and then the Sierras on the drive home. Some of those roads I took I might not take some of my other cars, VERY steep and dangerous.
When I travel to LA or Portland I am sure I will get better MPG as I will be just cruisin'. Just wish I could reset the figure in the trip computer.
ps. You need to update your avatar and RV info