Did your dealer send you away from your purchase with your first tank full? I told my dealer all the new vehicles I had in the past were provided to me with a full tank, so they went and filled it up before I took possession. My point is that if the salesman did your first fill up, he may not have given you a completely full tank, or at least not filled it up with the same fill technique as you, and that could account for inaccurate mpg.I only got 18 mpg on my first tank. Not what I was expecting. I drive in a lot of traffic. The 2.7L I drove for a week got 17 on the same commute. My 6.2L I traded got 14. I was hoping for 22. Maybe it will increase as it get broken in.
Sure glad I ran Stanadyne Performance Formula all winter...Diesel Fuel Additives
- It should not be necessary to add any aftermarket additives to your fuel if you use a high quality diesel fuel that conforms to ASTM industry specifications. Aftermarket additives can damage the fuel injector system or engine.
- Use Motorcraft® cetane booster or an equivalent cetane booster additive if you suspect fuel has low cetane. Use Motorcraft® anti-gel & performance improver or an equivalent additive if there is fuel gelling.
- Do not use alcohol-based additives to improve cetane quality, to prevent fuel gelling or any other use. The use of alcohol additives may result in damage to the fuel injectors and system. See Engine Specifications.
- Your warranty may not cover repairs needed to correct the effects of using an aftermarket product that does not meet Ford specifications in your fuel.
The point of I was trying to make was I got pretty darn good MPG on windy mountain (not flat) roads in sub-optimal weather conditions, and that maybe? my average MPG is improving due to diesel engine "break in"Had to run upstate to pick something up which required a 110 mile trip (one-way) on NYS Rt 28 thru the Catskill mountains. Outbound leg was on a partial tank so it was hard to gauge a realistic MPG, plus this was my first highway driving in a few weeks, so I am pretty sure I was in regen on the leg out. I knew the return leg would be a better test, as I had to fuel up at my destination because I was near empty, but ran into the Rapid Fill "big" nozzle issue until I found a Speedway with the smaller nozzle that fits our capless fuel tanks.
On the way back I averaged 29.5 MPG on the trip computer in weather conditions just above freezing but below 40 degrees F. Considering this was mostly 55 MPH roads winding thru the mountains and 20-30 MPH in the small towns in between, I didn't think this was too shabby at all, considering I have a Platinum with AWD and the 25 MPG highway EPA-mandated window sticker average. I started out in Normal Driving Mode and switched to Eco mode about halfway thru on the leg home, so I am convinced I could have broken 30 MPG average if I had switched it into Eco from the start.
I have ~6500 miles on the odometer now and I am running Stanadyne Performance Formula as an additive, so maybe my engine is starting to loosen up.
I've got a bunch of trips back home to Massachusetts in the next 6 weeks, so I am interested to see what I can get for MPGs in Eco Mode on Summer Diesel -- I would be ecstatic if I can average over 30 MPG on trips to Boston...