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My truck does not like winter fuel. This summer I could get 19 to 20mpg doing city/hwy mixed driving. Freeway at 70mph would yield 21.5 or a little more. With this winter fuel, I have dropped to 17 mpg city/hwy and 19 or so freeway. It is what it is.
I tend to agree with the embellishing bit, but maybe not. Some are even saying their getting 22-24+. If it's true, I'd like to know what their doing different than what I'm doing. I drive extremely soft footed and can't get even close to 19. Maybe I need more miles on the truck.
F350, SRW, 4x4, 3:55, Lariat CC long bed with camper package 5vr prep. I'd of gotten a chandelier, but they didn't offer it.
I get 21.9 mpg on highway that is flat here in Arizona. I got around 23 mpg with the flip cover on the back which reduces drag from an open bed and tailgate. I reduced to 21.9 when I changed my tires to BF All-terrains. When I get into hills my mpg reduces to 16.9 while climbing in the mountains.
Mine seems low also compared to everyone else. I drive in Wisconsin, hilly, curvy drive to work 15 miles at 45-55 mph and the rest which is 30 more miles on the highway at 65-70 mph and get 15.9 mpg average on the truck meter. I don't beat the truck but sometimes can't resist stepping on it once in a while. During the summer and before the flash I was at 19.5 mpg. After the flash it would average 17.3 mpg. But I expected it to drop in the winter and roughly 16 mpg which I think is still pretty good.
I have 6500 on the truck now and do not see a difference in mpg so far with added miles. I too was hoping for increase but nothing so far it seems to be the same.
To answer your question - I don't think that you are doing anything wrong.
The average MPG that you are talking about has to be from different information donors and over a short period of time. These trucks simply do not see those numbers consistently from a single vehicle/owner.
I have watched my mileage since day one. The first thing I determined was that the Fuel Computer was quite accurate. It stays within .5 mpg of what a hand calculation shows. The Trip Computer is also quite accurate. Since I installed the 51 gallon Titan tank I use it to keep track of fuel used. My fill ups are always within a gallon or less of the dash reading. I am confident of my mileages. No need to exaggerate, who would I be fooling...I, too, am a little leery of 24 mpg claims for a regular reading. Under ideal conditions, maybe. However, the many who post 17 to 18mpg city, 19 to 20 hwy and 21 to 22 on the freeway at posted hwy speeds are consistent with my results.. As I posted a little bit ago, my truck does not like winter fuel. Others have posted similar mileage drops. My truck did consistently improve on mpg as miles piled up. I started out at 16 hwy and eventually ended up at 19 hwy after 12000 miles or so. I have 17800 miles on it now. It will be interesting to see how she runs next spring when we get the good fuel back.
I was only showing 16.5 before the winter blends in the Midwest showed up and based on other comments here, like you, I thought something was wrong. Turns out my odometer was off by quite a bit (one trip showed a 13% variance). A lot of guys are reporting their odometers to be off by 3-5% in their favor so I would double check that. It's not a lot but it does add up. To get accurate readings, I have to GPS my exact route and then hand calculate it and based on that, I'm getting in the 18 range. You're in a warmer climate so I would expect you to get better mileage but regardless, you seem to be in the average range. Winter blend sure does mess with the mpgs though.
I also have watched my MPG closely from the start. I consistantly get 14 around town with short trips, longer in town trips where the engine actually gets warm bumps it up to 16.
Highway miles also seem very effected by cold vs warm. I drive 20 miles to work and get only about 15 mpg average from a cold start. The same trip when well warmed up gets me 18 mpg. Straight highway miles when warm go up to 20-21 if I keep my foot out of it.
Certainly not scientific analysis by any means,but in my 6 months of use it seems fairly consistant that I get much better mileage after the truck warms up.
Your mileage will depend on a LOT of factors. The truck weight, rear end, tires and tire pressure, bed cap or cover. Then add in the fuel quality and cetan rating, Summer/winter blend, any additives, your driving habits and the terrain you drive across and the elevation, temperature and humidity.
There is no way two trucks will get the same mileage, So we are always talking about ranges of performance.
Towing the various trailers that I tow, 11.5 to 12.5 mpg. empty all city driving with lots of short trips. 14-15. City driving with some hiway mileage 16. All hiway empty driving at 70mph or less on summer fuel at summer temps, for 300 mile trip. I've gotten as high as 23 mpg. Maybe I picked a fuel stop that day, maybe I had a tail wind or was just lucky enough to have the perfect humidity/temps/and additive in my fuel that day.
Like Rickatic, My lie-o-meter is pretty darn accurate when I've checked it against my hand calc. Not on any 5 minute avg, But when compared full tank to full tank. I'm happy to be seeing it display 16 mpg most of the time. But I can brag that it's done better on a few occassions.