Grit dog wrote:
16-1800rpms seems a bit low for towing that load at 65mph. Ime lugging Uses a bit more fuel than higher rpms towing. Can see it in the egts as they only go up with fuel usage.
I stuck brake would have burned itself out and youd smell it if it was hanging bad enough to knock you 3-4mpg I believe.
When I used to watch mileage on my trucks there would just sometimes be worse mileage seemingly inexplicably.
Since it sounds like everything is pretty normal w the truck, runner for a full tank or 2 unloaded and see if you get correspondingly bad mileage. If it's a real engine condition causing it, you'll get poor mileage empty too.
And get a tune for power, not mpg. Good tunes will squeeze out a little more mpgs in general, but ime you end up using the power which uses some fuel!
Nah, 65MPH will put you around 1700RPM on the Dmax which is about the sweet spot for towing a 10klb load with that motor on flat ground. If he was towing at that speed in 6th at 14-1500RPM the yes he would be lugging it which doesnt help with mileage.
