Okay.. first I apologize if I have posted something that has already been answered.. I hate when people do that so I searched hard, but haven’t found my answer... this forum and the guys posting here are full of info.. awesome.
I am looking at buying a 2004 F250 5.4L V8 3.73 lmt slip FX4. But.. full after market conversion package.. lift kit oversized tires.. etc..
I am very concerned about mpg as I put on 15-20k / year.. but can’t own anything but a ford truck… I believe the 5.4L will get me the best mileage over the V10. I don't want a diesel.
So… this truck that has 4” suspension lift and 305s rather than the stock LT235… 31.7” to 32.8”
looks like my 3.73 gear is now 3.6 this affect towing.. which is fine.. I tow a 3000# ski boat occasionally… no issue.
but.. the bigger tires throw off the speedo based on that site above also.. so I need to calculate the mpg differently based on traveling farther than my odometer indicates.. but the lower gear ration gets me better gas mileage right??
I guess my real question is what gas mileage I can expect. Either based on above details and expectations… or if someone out there has a similar truck and experience.
not sure if it makes much difference.. but the truck is a super crew, short box, 4speed Auto transimission
Thanks for any help...
Last edited by abigfordtruck; 12-01-2006 at 10:15 AM.
Reason: change title
Me driving the '02, (7.3L, 3.73, 4x4, 265-75 tires, CC, 6ft bed) at 70mph (2000rpm) consistantly gets 19 not towing. Towing at 70, or driving at 80 drops it to 15. Ya just ain't gonna get that mileage/power with a gasser, sorry.
There is a multiple thread discussion not to long ago on the 5.4L vs 6.8L mileage wise with this large of a truck.
I can't imagine expecting very good MPG especially with a lift and even moreso towing. A neighbor has a 5.4 SD and his description of trying to tow with it makes it sound like it's something you only want to do in a pinch. On the other hand, I know of a super cherry 2002 5.4 F250 2 wheel drive that tows a trailer with a couple of bikes (custom and an old school Indian I believe it is) and they seem to like it just fine, and are actually selling it because they don't need a F250 for anything else and want to downsize.
__________________ 2004 EDDIE BAUER EXCURSION, White, 4x4, 6.0 PSD
Eddie Bauer Premier, Trailer Tow Group, Cargo Group, DVD w/wireless, 3:73 LS, TC Skid Plate Magnaflow Exhaust, Isspro gauges, V Code's, 285/75/16 Bridgestone Dueler Revo's
If this truck is a conversion package, then the speedo and odometer should already be reprogrammed to match the larger tire size. The new 3V 5.4L has been doing better on fuel from the sounds of it than the older 2V models. Basically don't plan on more than 15mpg on a good day, and expect close to 10 or less towing. Due to the extra weight of the SD truck, plus a trailer it just doesn't have the low end grunt to pull without using more fuel.
A friend of mine has an 01 F250 5.4L with a 4" lift and 35s with 4.10 gears. Unloaded he gets around 12mpg with it, pulling a 16' trailer with an Explorer Sport he gets around 9mpg. Granted he does have a little bit of a heavy foot, and likes to tow at 75mph. Though the mileage doesn't go up that much when he slows down. Just remember that the 33s have a higher rolling resistance due to a larger rotating mass to get moving, as well as higher friction with the highway due to the width. The height is killing you as well in wind resistance. You're basically trying to move a 7000lb barn door down the road.
Overall I've been impressed with the 5.4L in my friends truck power wise and it wouldn't bother me to own one. He can keep pace with me for the most part, though throw a trailer on the back and I can walk all over him. Though hes always way out in front when we tow together, but I like towing at 70mph more since I take a big hit in mpgs over 70.
99 F250 PSD 4x4, 5" DIY exhaust, CCV mod, DIY intake, PMT1 with DP Tuner chip (stock/40/80/120), BTS VB, Suncoast Extreme Trans with SD43 converter, FASS fuel system.
Trail Rig: 95 Ranger on Kingpin D60/14 bolt/D&D Doubler.
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