Real MPGs for your rig?

#92
2003 7.3 E350 box truck with a 14' box and 4.10 DRW. Last 600 mile round trip I got just about 12.0 mpg driving 65 - 70 and going from sea level to 5,000' and back again. I've put about 4,000 miles on this rig since I bought it a little over a year ago and it looks like my average has been just over 10 mpg. My best mileage was 13.4 bringing her home when I bought her 450 mile away and running empty other than my 700lb. Fat Bob in the back. All of my trips, excluding the last one where I maintained 65 - 70, were running the speed of traffic which was probably closer to 75 - 80. My projected frontal area is basically 8' x 10' so imagine pushing two sheets of plywood perpendicular to the wind at 75 mph. It would be interesting seeing what kind of mileage I could get at a steady 55 but thats not likely to happen as long as I'm on the interstates. Loaded, which is the only way the truck gets driven, I'm at about 6 tons. There's no free lunch. Otoh, the van serves as our camper/toyhauler, has plenty of headroom to stand and walk around, eliminates dragging a trailer around, and we can comfortably sleep inside while fully loaded with two road bikes and all of our gear. Modifications follow every trip and it just keeps getting better.
 

java

Expedition Leader
#93
2008 F450 Box truck, 4x4, RV conversion, 14.5k lbs, tall cabover (4' over cab) 6.4L diesel. 4.30 rear end, DRW 22/70r19.5's

10MPG combined at 68mph or less. Any more it turns too many RPM's. It always gets 10 (over 15k miles) a little better if there are no passes, but there are always passes....
 
#94
On our last trip we got 16.7L/100km (~14mpg). That's weighing in at 3,530kg with the bubble roof. In this neck of the woods every trip starts off with a gnarly headwind through the foothills and numerous mountain passes. This particular trip also included a "quick" 20km jaunt up a 800m fire road so I was pretty happy with that mileage and it's close to the best we've ever gotten. Normally things are closer to 18L/100km. For comparison, our Crosstrek on day trips gets at best 8L/100km (~30mpg) and I'm a speed limit kind of guy.

Some of you must have some seriously flat roads to get the mileage you do!
 

Bikersmurf

Expedition Leader
#95
Oddly enough, my best logged mpg was on a narrow, winding, mountain highway in a snow storm. It was about 100 miles and went from sea level to the summit at 1156 ft and down to sea level with a few ups and downs along the way.

The Turbo was on hiatus, speeds were steady but slower, no quick starts or stops. I by the fuel used I saw 11 L/100 km (21.38 mpg). From a rig with a big box weighing 9600 lbs. Its corners on the top have a 6” radius... and it’s frontal surface is 88” with and it’s about 102” tall. Unlike a standard box truck, it spent time in a wind tunnel during its design phase.

The moral... the more you push the pedal... the more it’ll drink.
 
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