I recently took a trip that forced me to reread a few important threads on here. "Stuck in regen"
is an important one but there are others. In short, I've had my truck for a little over 6 months now and think I have exhaust filter regens and overall truck nuances down .. but maybe not. Maybe it's just me and my expectations for this truck. Y'all let me know.
I left for my trip (all interstate) and soon after leaving the truck kicked into regen. I was around 60% full but since I don't have OCR enabled I was expecting this regen as I knew I was close to 300 mile-mark. I keep a watchful eye on my filter percentages and plan to add OCR in forscan soon. After the regen, my truck never went above 0% full that I saw and I assume that is due to passive regen at highway speeds. I filled up my DEF fluid prior to the trip but, after driving the 500 mile one-way trip, I had used approx 3/8 of the DEF fluid tank. Is that a normal amount? Seems high, but maybe the tank wasn't completely full. On the trip to my destination, I averaged less than 21 mpg, which is disappointing. I wasn't hauling anything but kept my truck around 80mph (allegedly, lol) on a flat empty interstate when I could. On the way back I didn't use up any noticeable amount of DEF and got about 23 mpg but went slower (70-75max) due to traffic. The entire trip was done in eco mode and I'm easy on the throttle, no big pulls to pass people. I actually kept an eye on my fuel consumption meter most of the way back and tried to maximize fuel efficiency on the return trip and 23 was best I could do. That's close to best tank ever for me too.
The fuel efficiency on this trip and in ownership has been discouraging. It's not terrible
but I'm a far cry from the numbers some boast (uppers 20s) and what I expected from this engine, especially in interstate driving where everything should be somewhat even. Should I be happy with those numbers? Are regens the culprit? Why do some boast such great mpg that I can't seem to get? In the past 4-5 tanks I've been in eco mode 100% of the time, I really am trying to squeeze every last mpg out of this baby!
Of note: My lifetime average on this truck is 21.2mpg calculated by hand. I typically drive a mix of 2/3 city and 1/3 highway. The truck itself currently sits at ~9,000 miles after this trip and is essentially stock. It has 3.31 mpg-friendly gears, 4x4, tires are always at proper pressures, Rotella T6 oil at 6,000 according to the "severe duty" specifications in Ford's manual, auto-start-stop disabled, and I use Stanadyne Performance fuel additive at every fill-up.