My '01 is a CCLB, Auto, 4X4, 3.73 Diffs. Only mods are K&N CAI, 4" MBRP Turbo-back exhaust & a Hypertech Power Programmer 3 set on Stage 2.

Usually, running the freeway @ 65-70mph, cruise on, I average 16-17 mpg. The best I've ever gotten was 19.2 mpg. That was driving through Oregon on Highway 97 when the speed limit was 55. (Has since been raised to 65 between towns). I'm pretty sure the lower speeds allow for better mpg, given the truck isn't working that hard w/less wind resistance.

 

I’m same as supercruty. Average 17 highway empty and can hit early 19s with the tonneau cover and trying.

4x4 short bed auto and level kit with 285/75r16s and 3:73 gears. 3:55 would help me a lot but my truck is used for mainly towing so I’m happy.

 

Just purchased a 2001 excursion. Is Diesel Kleen really worth using? Thanks.

 

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depends who you ask.

 

Did you swap to 3.55s? I don't think that was a factory option on 7.3 Superduties.

 

Yeah, you're right. Mine is 3.73. My F150 before this had 3.55s.

Sent from my SM-J327P using Tapatalk

 

I'm only getting 11.5 lol.

2.5" lift, 35.5x13 trail grapplers, 20x10 wheels, KC turbo, 4" exhaust, intake, new international injectors, hydra set between stock, 65 and 100, 3.73 gears.

It's mostly my driving style though. Every stop sign is boosted launched and WOT for most of my highway runs. 4" straight pipe is honestly the worst mod I have ever bought. I can't keep my foot off the floor as it sounds too damn good.

Highest I've gotten with my new injectors was 14.5 on a 40 mile drive but then I got bored.

 

You can't believe the meter, hand calculated is the only accurate way to get mpg.

 

I run DK if anything for the added lubrication. I pick it up when it's on sale so I always have a bottle in the truck. As mentioned, if anything, it quiets the injectors down a tad. YMMV.

 

The only time I pay attention to MPG is when towing. I rarely daily drive it enough to get an accurate unloaded MPG.

Towing I usually get between 10-12MPG.

This is with S&B intake, MBRP 4" exhaust, DP Tuner with tow tune. I tow a 22ft enclosed race car trailer about 8k lbs loaded at 78mph.

 

15mpg city driving 10 miles one way to work.

 

YEP, THAT'S ABOUT RIGHT. SLOWER SPEED = + GPM

 

I must be getting older - my fuel mileage is getting better lately!

 

Other things to consider even with a diesel engine, especially at higher highway speeds.

Bigger - wider off road tires, especially mud terrain, have a much higher drag coefficient. Equaling lower fuel mileage

Lift kits have more parts hanging down to catch air under the truck

Toppers or hard top tonneau covers can aid in fuel mileage. But racks and gear on the roof take mileage away.

 

Wow. You guys make me jealous. I'm getting 13-15 mpg, sometimes dropping to 11 mpg. Current set up is an S&B intake, a 5" tube into a Donaldson muffler, TS 6 position chip. F250, 4wd, and I try and stay off the skinny petal.

I'm thinking about a Hydra. I've heard good things. Anybody have a comment on the mileage difference if there is one?

 

Important to keep in mind, that this time of year, Winter Blend fuel is diluted with Kerosene and there's a bit less energy in Kero. So, pretty much everybody see a drop in mileage with it.

Also, and I hate to say it, but there's really not much we can do about it (other than making sure everything's right tire pressure/filter & exhaust/free rolling brakes). Spending money to improve mileage never gets repaid I think. No tuning or engine components are going to overcome the trucks weight - displacement - aerodynamics