Milage
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Milage
Hello to who ever can answer these questions and thanks in advance.
First is I think I have read some where on here that bigger tires than stock help gas mileage. I have a 2001 f350 4x4 dually and have been averageing around 15 to 15 and a half miles per gallon. Tires I have at 235x85x16. Thinking about going big enough to fill up fender well or maybe not. Seems to me more rotating mass should equal less miles per gallon please tell me where I'm wrong. First deisel first dually. Also fighting lane wander greased the crap out of everything but not much if any. OK there you go. Any comments welcome. Thanks
First is I think I have read some where on here that bigger tires than stock help gas mileage. I have a 2001 f350 4x4 dually and have been averageing around 15 to 15 and a half miles per gallon. Tires I have at 235x85x16. Thinking about going big enough to fill up fender well or maybe not. Seems to me more rotating mass should equal less miles per gallon please tell me where I'm wrong. First deisel first dually. Also fighting lane wander greased the crap out of everything but not much if any. OK there you go. Any comments welcome. Thanks
Posting Guru
Joined: Mar 2010
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From: Upstate NY
Hello to who ever can answer these questions and thanks in advance.
First is I think I have read some where on here that bigger tires than stock help gas mileage. I have a 2001 f350 4x4 dually and have been averageing around 15 to 15 and a half miles per gallon. Tires I have at 235x85x16. Thinking about going big enough to fill up fender well or maybe not. Seems to me more rotating mass should equal less miles per gallon please tell me where I'm wrong. First deisel first dually. Also fighting lane wander greased the crap out of everything but not much if any. OK there you go. Any comments welcome. Thanks
First is I think I have read some where on here that bigger tires than stock help gas mileage. I have a 2001 f350 4x4 dually and have been averageing around 15 to 15 and a half miles per gallon. Tires I have at 235x85x16. Thinking about going big enough to fill up fender well or maybe not. Seems to me more rotating mass should equal less miles per gallon please tell me where I'm wrong. First deisel first dually. Also fighting lane wander greased the crap out of everything but not much if any. OK there you go. Any comments welcome. Thanks
because if the gears are stock you should have a 4.10 ratio, which is great for towing, when you up the tire size you basically make the gears taller, which will affect your towing performance
if you want taller tires for milage only, I would just keep them stock, however a leveling kit and 33" look great on a dually, other thing is watch the thickness of the tires you choose, youll probably need a spacer for the rear end otherwise when your loaded the sidewalls will rub and cause a blowout, and IMO spacers are worthless would rather leave well enough alone
put the nose of the truck in the air and check for loose ball joints/ tie rod ends by moving tires
put nose down and have a helper get in the truck and turn the wheel slightly while you put your hand on every moving part under the front end to see if anything is loose
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Thanks for the response you are correct. 4:10 gears with limited slip. Sorry I made this a guessing game. I will try to be more clear next post. And for as raising truck up and checking I had a local shop do it with which it cost a little to get what you mentioned done and they told me nothing to find. Well guess I need to see or do it myself to be sure. Thanks again
Posting Guru
Joined: Mar 2010
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From: Upstate NY
Thanks for the response you are correct. 4:10 gears with limited slip. Sorry I made this a guessing game. I will try to be more clear next post. And for as raising truck up and checking I had a local shop do it with which it cost a little to get what you mentioned done and they told me nothing to find. Well guess I need to see or do it myself to be sure. Thanks again
heres something to keep in mind, I rebuilt everything on the front end of my 24 valve, bearings, trac bar, ball joints, u joints, drag link+tie rods, sway bar bushings and couldnt figure why I still had sloppyness/wander on the highway
do you have slop in your steering wheel when you turn your truck off? my dodge did, I did not have a helper so I took my video camera on my phone layed it on the ground so it was video taping my pitman arm and steering shaft
next I hopped in the truck and just moved the steering wheel through the slop I did NOT try and turn the wheels just move the steering wheel through the slop
I watched my video to see what was happening and my steering shaft was turning but my pitman arm was not budgeing at all, told me that my bearings in the box were shot
new steering box later and some power steering lines and all was well, figure something you could check
good luck
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
Larger tires do not increase fuel mileage. While it does change effective gearing, you end up with more rolling resistance, more air resistance and more rotating mass to get rolling, all of which work against you.
Mountain Pass
Joined: Nov 2010
Posts: 168
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From: Princeton Minnesota
If it helps, my 2001 F350 SRW has 37" tires with a leveling kit and 3.73 gears. You probably wont want this tall a tire on a dually but my mileage is 13-15 hwy and solid 12 around town. Biggest factor in milage with our trucks is the nut behind the wheel....Your mileage right now is at average. Check out the 199-2003 7.3 diesel forum, lots of great info in here. Good luck and welcome to the FTE!
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