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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 02-23-2011, 06:44 PM
fernesto fernesto is offline
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351 MPG

I have a 95' F250 with the V8 351 in it. I'm not sure what gears it has, and I usually drive 45-50 mph. Im getting about 9 MPG with it. What does every one else with similar configuration get?
Thanks
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  #2  
Old 02-23-2011, 07:01 PM
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On your door or door jam there is a sticker. Look for axle code and get back to us. There's a chart to lookup the code.

What kind of cab do you have, 2 or 4 wheel drive?
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  #3  
Old 02-23-2011, 07:14 PM
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Steady 10mpg all day long. City/hwy is the same, a/c running or not. Truck has been steady 10mpg for a long, long time..never fluctuates. Mine is a '96 though, FWIW.
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  #4  
Old 02-23-2011, 07:54 PM
USMC0351fordtruckin USMC0351fordtruckin is offline
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i have a 5.8L in my truck but other than that it's a lot different, but i still only get 11-12MPG and that is on nice days when there is no show on the road, in bad conditions i get about 8-9MPG if im lucky haha... its a '96 F-150 5.8L E4OD A/T 4x4 w/3.08 open diffs and 265/75R15's which are only around 29 or 30ins. ....
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Old 02-23-2011, 07:59 PM
madzx2 madzx2 is offline
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my 88 f250 351w c6 4x4 3.55's and 235/85/16's gets 6.8 mpg
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  #6  
Old 02-23-2011, 08:00 PM
rikard rikard is offline
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My BIL had a 91 reg cab F 250 4x2 with the 351 and a utility body. It barely got 11 mpg running empty. It had 4.11 gears and 16.5" rims with 80 series highway tires. It did have the HD trailer option for hauling gensets and utility trailers and the gas mileage never dropped much below 8 when towing. IIRC it was rated to tow around 8500 lbs. Very good truck, but the electrical contractor eventually replaced it with a Ford diesel van.
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Old 02-23-2011, 08:14 PM
CWPottenger CWPottenger is offline
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I get about 14mpg with my 90 351W 4x4 supercab.
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  #8  
Old 02-23-2011, 08:25 PM
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when stock with 351W, E4OD, 3.55 gears... 12 city 16 highway.

slightly modded, stock 351W, E4OD w/shift kit, 4.10 gears... 11 city 15 highway

heavy modded, dont know yet hadnt got it running...
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Old 02-23-2011, 09:19 PM
fernesto fernesto is offline
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I have the regular cab, 4x4, 4.10 gears. It also has the heavy duty front and rear suspension for a snow plow, and a full bed salt spreader.
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  #10  
Old 02-23-2011, 09:26 PM
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You crew cab E40d 4x4 351 gets 9....yeah...suck that for sure.
Had I known it would be that bad, I would have just gotten the 460, it gets the same!
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Old 02-23-2011, 09:27 PM
86sixbanger 86sixbanger is offline
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those numbers sound kinda low....
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  #12  
Old 02-23-2011, 09:31 PM
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...and just to continue my thoughts.
This has been a BIG pain in my side for the past 3 weeks I have owned this truck - it is costing me a fortune...Wishing I had researched it before I went to the 351.

My efforts are going to be slap a 4r70w in, decent converter, Optishift computer, mustang EEC with MASS AIR. SOUnds like a lot of work just for MPG...but I have other motives as well with that setup.

I will also be ditching the smog stuff, smaller crank pully, electric fan - this will make less rotating mass free up power.

I have hiway gears as well, so I think, have not checked, it cruises at 80 around 1900 rpms...I do mostly city drives, so deeper gears should help really...and with the bigger tires I plan on putting on, will be necessary.

it is a lot of work, but A centurion is worth it.
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Old 02-23-2011, 11:05 PM
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1900rpm at 80mph! Are you serious? if so the gearing is less than ideal or you have oversize tires on it and the speedo hasn't be recalibrated for the tires.
For best milage these motors need to turn about 2000rpm at 70mph give or take, but heavier trucks need more gearing while lighter trucks can get away with less. My 5k extended cab got 13/17 no matter how I drove it with 3.55 gears and 31" tires.. just so you know what is possible.
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Old 02-23-2011, 11:17 PM
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96 F150, Std. Cab, short box, 4x4, 3.55 LS, stock tires, unloaded I (used to) get 15-17 highway on my commute during the summer, down to the neighboorhood of 12 during the winter. Hauling my toolbox and belongings in a trailer from Michigan to Washington state this December, 9-11 mpg. Across the plains, with a headwind, up mountains, overdrive on or off, didn't matter, 9-11 all day. Now that I'm out here, and I drive 2 miles to work in the city so the poor thing never gets warmed up and I am pretty sure a head gasket started weeping somewhere in Iowa, it's so bad I don't even calculate it. This summer, driving to Kentucky, all highway, unloaded, I got almost 20 (19.5) Honest! Than again, that is using the completely innacurate "Divide mileage from last fill up by gallons it took to fill back up" method. Not an exact science, but close enough for gov't work...
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Old 02-23-2011, 11:21 PM
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My 92' F-250 351 ZF5 4x4 with 355's gets a consistent 12/16. I actually think the higher gears are hurting my mpg's. If I'm starting off on an incline at all, I have to use 1st. gear. Guess it's a good thing that this is my Sunday Go Ridin' truck...lol.
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In 5 minutes someone opened the door, popped the hood, started the truck, broke the heated seats and stole your horn and then just left? Where the hell do you live??
05' X-LTD V10/4.30's_____92' F-250 4x4 351w 5sp.
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Old 02-23-2011, 11:21 PM
 
 
 
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