If I really, REALLY baby it, I can get 12mpg on my daily commute. On a recent trip towing my toys and with a 10' cabover camper, I averaged 8.5mpg. It's not a gas sipper and wasn't designed to be. But, for the power it delivers, I'm satisfied with the mileage.
Looks like taking it easy in town driving I am now getting about 11 mpg.
It likes about 60-65 on the "flat" HWY for best gas milage, which seems to be about 15.5 mpg empty.
Higher octane gives me about .5 mpg higher.
This is a stock motor, only modification is to the muffler/tailpipe.
Suspension is a 5 in. lift, 4.30 gears, and 37 in. tires.
Lot of weight and resistance to push.
Wish I could put the newer 6 speed auto transmission in this truck.
Motor design is, in my opinion, a mistake.
Should be a 4 in. bore by the 4.125 stroke!
3.625 bore is a mistake!
That is another topic for discussion!
My '99 F250 SC LB w/ 3.73s gets 13-14 empty in mixed driving here in Phoenix. However, I drive it like it's a big heavy truck (slow and boring). When my wife drives it, she gets 11-12. The best I've gotten is 14.1 average on a tank.
Had my 2010 for a month now, it is dead stock with 50k miles. It has 4.10 gears & according to the build sheet it rolled off the line with 18" wheels. Apparently some fool thought it needed a set of the factory 20"s on it before I found it. Combined city/highway unloaded was getting 10 mpg. Bought a set of factory 17"s and Toyo ATIIs in 265/70/17, now I'm getting 11 mpg. Have a Flowmaster ex. & Airaid intake waiting to go on, probly wait 'til I get the SCT tuner & do it all at once. After I get the snow plow springs off the front & a B&W Companion hitch, it'll be time to sell the old diesel.
Oh yeah, my work truck is a 2012 F450 V10 auto with aerial lift (aka AT&T bucket truck). It weighs somewhere south of 12k lbs, gets 7 mpg, and the 4.88 gears make it move off the line. Driving this baby for the last 6 mos. is what convinced me I did NOT need to pay $7-8,000 more for a diesel in my new-to-me personal truck.
2010 F250 Lariat FX4 S/C LB V10 Auto
2000 F250 XLT 2WD 7.3 Powerstroke Auto
327TB Wanderer Wagon
Empty on the freeway ~9.5mpg
Mixed around town ~8.5mpg
Towing 5-8k ~6-7mpg (depends on how many hills we have to conquer)
Disclaimer: I'm not known to have a light foot.
I'd probably do better if I wasn't running a 4" lift with 35's but I will never know...
However the little 5.7L GMC half ton this replaced only got 11ish around town, 12-13 on the freeway and I don't even want to know towing. That was with just a TB crank lift/blocks and 285 tires but wimpy 3.43 gears...
I'm ok with the mileage compared to the price of a comparably equipped diesel and the on-going maintenance required.
I owned a 2001 F250 2v supercab. Always gave me 10 mpg. Thats why when the wife told me I could have a new to me truck I started looking at diesels. We drive 20010 6.7 for work and they have been in the shop CONSTANTLY. Cab off ever other trip in.
I finally settled on a 2009 King Ranch with the 3v. We just got back from Anehiem (dippy land) and besides the parking, She was a blast. speed limit between SLC and most of the way there is 80 now, so I did 90, with a bed cover I averaged 12.5 MPG at the pump not the computer. Don't have my new fifth wheel yet, but can't wait to double down to lake Powell with the new toy!!
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