How to improve mpg's n '96 7.3??
Posting Guru
Joined: Nov 2007
Posts: 2,158
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From: West Texas
I think that's why I got such nice mileage driving in the snow. I was running about 14 or 1500 rpm. It would get me searched around here. I'm not sure but I think in my truck 1450 s about 35 mph or so. It's 200 at 58 in 5th gear. That sucks.
Postmaster
Joined: Feb 2004
Posts: 3,266
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From: Levittown
1 US gal = .832674 Imp Gal
At 28 something is not right.
The fuel station must be giving fuel away with a slow meter.
BTW- Bio up front is less but cost more over the long haul
due to you use more fuel!!!!!!!!
My van will net better mpg loaded (inside weight).
B
At 28 something is not right.
The fuel station must be giving fuel away with a slow meter.
BTW- Bio up front is less but cost more over the long haul
due to you use more fuel!!!!!!!!
My van will net better mpg loaded (inside weight).
B
Senior User
Joined: Apr 2007
Posts: 400
Likes: 1
From: Richland, WA
I have a 97 Crew Cab F350 4x4 with the auto, 4.10 gears, and 285x75R16 ( about 33" tires). Driving 60mph I'm right at 2000RPM. I have driven an entire trip at 55mph (1700RPM) and have reached 19.4 mpg. Usually its 15-17 depending on the condition of my lead foot. That's with just a downpipe to 4" exhaust, no cat, and 6637 filter. I believe going to the 285's from the 235's (about a 31" tire) lowered my RPM's into a good range. Why get 3.55s? Just go to a bigger tire size. 
Post Fiend
Joined: Dec 2009
Posts: 15,505
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From: Livoina,La
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
The problem is...
But 10 is still low for even that setup. I'd never expect higher than 15/16 at 70 mph on a great day.
Unfortunately supporting mods are no miracle mileage boost. You can spend a grand easy and only gain a mile maybe 2 per gallon.
Look to mechanical issues like alignment, wheel bearings, dragging brakes, diffs in good shape, locked hubs(if 4x4), boost/exhaust leaks, MAP sensor and line quality etc. My guess is that at 10 mpg you have one or more of those issues present AND the single largest factor is the pressure applied to the skinny pedal. You can always back off the nut behind the wheel...
Originally Posted by Devore95
1997 f350 CC/ 7.3/ 4:10 gears/ 315 Cooper STT
Unfortunately supporting mods are no miracle mileage boost. You can spend a grand easy and only gain a mile maybe 2 per gallon.
Look to mechanical issues like alignment, wheel bearings, dragging brakes, diffs in good shape, locked hubs(if 4x4), boost/exhaust leaks, MAP sensor and line quality etc. My guess is that at 10 mpg you have one or more of those issues present AND the single largest factor is the pressure applied to the skinny pedal. You can always back off the nut behind the wheel...
Posting Guru
Joined: Jul 2008
Posts: 1,726
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From: bellingham ,Washington
so i can only get 11-12 in town and 14- on the highway, truck has 4.10's 5 speed on 33" tires and is running at 2500 rpm's at 70 .....my conclusions is this sucks and is bad mileage.........LOL
My plan is tunes and a brownie box that will make my 5th more like a 7-8th gear and that should cut the rpm's down and gain some mileage out of it
My plan is tunes and a brownie box that will make my 5th more like a 7-8th gear and that should cut the rpm's down and gain some mileage out of it
Senior User
Joined: Nov 2011
Posts: 326
Likes: 0
so i can only get 11-12 in town and 14- on the highway, truck has 4.10's 5 speed on 33" tires and is running at 2500 rpm's at 70 .....my conclusions is this sucks and is bad mileage.........LOL
My plan is tunes and a brownie box that will make my 5th more like a 7-8th gear and that should cut the rpm's down and gain some mileage out of it
My plan is tunes and a brownie box that will make my 5th more like a 7-8th gear and that should cut the rpm's down and gain some mileage out of it
Posting Guru
Joined: Jul 2008
Posts: 1,726
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From: bellingham ,Washington
sorry i may have spelled it wrong or maybe not...Its like what the older semi trucks had behind there trannys for extra high or low gears. i have found a small unit for midsizes its about the size of a 4 speed trans..
Fleet Owner
Joined: Jul 2006
Posts: 20,360
Likes: 822
From: Mi'kma'ki
tip of the day for 9th gen PSD owners.
here's something to consider.i'll keep it stripped to the basics.those who want to learn more can visit a hypermiller forum.
1.the underside of the truck is extremely dirty for air flow.
2.the less air you can intake into the grill/bumper or under body,the more aerodynamic you make your truck.
so actually two basic (just for starters) tips for you guys.one is spesific to your trucks.
block those holes in your front bumper.allowing air to enter there,increases drag.if you block them off,the air will be pushed to the side of the truck.
if your thinking "well its the same thing,your just pushing the air like a plow either way." it's not.the air will flow much,much easier around the truck than through the grill/bumper/underbelly.
it doesn't have to look bad either.i recently upgraded to this bumper for styling.there are attractive ways to accomplish this.here's mine for example:
https://www.ford-trucks.com/forums/a...1&d=1329532135
(i just need to come up with something now,to block the center hole.likely i'll just make a black plastic insert that blends in.)
you can take it one step further,and build a custom low front air dam for greater gains.
https://www.ford-trucks.com/forums/a...1&d=1311464470
(yeah,so this one isn't exactly attractive.im sure someone could do much better for styling.for the gains it provided though,i sure as heck don't mind it at all.
)
if at all possible (make sure you have a coolant temp gauge) for even more gains,try blocking off some sections of your grills.ok so that's 3 tips then lol (use common sense and make then removable.)
good luck.
1.the underside of the truck is extremely dirty for air flow.
2.the less air you can intake into the grill/bumper or under body,the more aerodynamic you make your truck.
so actually two basic (just for starters) tips for you guys.one is spesific to your trucks.
block those holes in your front bumper.allowing air to enter there,increases drag.if you block them off,the air will be pushed to the side of the truck.
if your thinking "well its the same thing,your just pushing the air like a plow either way." it's not.the air will flow much,much easier around the truck than through the grill/bumper/underbelly.
it doesn't have to look bad either.i recently upgraded to this bumper for styling.there are attractive ways to accomplish this.here's mine for example:
https://www.ford-trucks.com/forums/a...1&d=1329532135
(i just need to come up with something now,to block the center hole.likely i'll just make a black plastic insert that blends in.)
you can take it one step further,and build a custom low front air dam for greater gains.
https://www.ford-trucks.com/forums/a...1&d=1311464470
(yeah,so this one isn't exactly attractive.im sure someone could do much better for styling.for the gains it provided though,i sure as heck don't mind it at all.
)if at all possible (make sure you have a coolant temp gauge) for even more gains,try blocking off some sections of your grills.ok so that's 3 tips then lol (use common sense and make then removable.)
good luck.
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