Just wondering what kind of mpg every one was getting. My truck is a 06 4x4, all stock except the egr is deleted running on 285 70 17. I filled my truck up, drove go work 2 days which is a little over 200 miles and filled it back up. And then divided the gallons by the miles drove and came up with a 19.2 mpg. It's a mix of highway and a country road driving with a mix of a few stop and go red lights.

 

There's been a few threads on this, but I've never managed that high, best I got was 18 when I took it real easy on a long trip.

 

I got 17.3 mpg resetting the computer on the entrance ramp, driving speed 70 - 85 for about 50 miles in 75* sunshine (a bit different down here in FL) today. Around 12-13 mpg in-town. 05 F250 thats new to me and part of the shake down cruise. I hope to get that kind of mileage!

 

I have an 06 4x4 Sup Cab short bed. 265/70R17 tires, Stock, EGR is not deleted. Best I got when I first bought it was about 17.8 highway. Last long highway drive got about 16.6. In town about 12 to 13 mpg. Curious what your PCM and FICM strategies are if you know them. My PCM strategy is VXCF5H5. No idea what my FICM's strategy is.

 

At best I get 18mpg on long hauls going 65. On average I get around 15mpg around town.

 

You can't base mpg on one fill up, there are too many variables. Average it over several fill ups with similar driving style. If the tank has not been harpooned, google it and do it to your tank. It will allow you to get more fuel in the tank and give you the piece of mind the tank is actually full.

My average over 48k miles is 16.6 mpg with a high of 19.1 mpg not towing. Towing the 5th wheel I average 11.8 mpg with a high of 15.4 mpg over 25k miles.

 

There are two factors that affect MPG: the quality of fuel and the health of your truck.

I regularly use PM-22 in my truck as it's a catalyst that improves the quality of the fuel but also lubricates and helps the HFCM do what it was designed to do: keep water away from the injectors,

The rest is how well maintained your truck is, condition of your fuel system, how healthy your injectors are, the PCM and FICM calibration, and last but not least, how heavy your right foot is.

My '05 Excursion on the latest averaged 18 mpg coming home bone stock when I first bought it. When I had the engine work done, (studs, EGR delete, and exhaust) it rarely got more than 15 mpg. Come to find out, it didn't like the 4 inch exhaust I had installed. It didn't matter how hot I tuned the truck, it didn't like it. I slimmed the exhaust back down and the terrible lag I had disappeared and the truck had more Huevos. This is why I tell people don't buy into the hype of having to get a 4 inch exhaust. If the truck does well with the factory exhaust, leave it alone.

The other half of it was the PCM and FICM calibration. I rolled mine back to earlier versions and when I did, mileage and power noticeably picked up. I averaged 19.5 mpg on a 12 hour drive and home from Alabama and put down 411hp and 756 torque on the Dyno.

An IDS will tell you everything you need to know about your truck and then some, especially the power balance with FICM compensation off. This is one reason why I don't like the latest flashes, they compensate for injectors to the point of failure. Whereas with the earlier versions, they didn't compensate or cover up bad injectors,

 

I have an 05 4x4 with the 6 speed manual. On the highway I can get 21 mpg not towing as long as I keep it 70 and below. Usually 18 around town. Towing a 10,000lb trailer I was getting ~14 mpg on a tow to Chicago and back to Georgia.