Any idea how much mpg will drop with a 3.73 instead of 3.55? Thanks
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Thread: MPG Difference: 3.55 versus 3.73
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08-31-2015, 08:40 AM #1Junior Member
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MPG Difference: 3.55 versus 3.73
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08-31-2015, 08:58 AM #2Senior Member
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id have to say .5 - 1 mpg. Depends on how you drive or where you drive.
Originally Posted by haze
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08-31-2015, 09:10 AM #3Chief Moderator
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Kid. If u don't know. Please don't guess. Originally Posted by Ford Fan#1
I have the 3.55's. I average anywhere between 18-22
My buddy has the same truck in an fx4 and 3.73's he gets 15-17. And we drive about the same.
Your Rpms are higher with the 3.73's. Thus the small plunge in mpg. Now. That is just between our trucks. Others vary. Just giving my scenario hope I helped
5Star tuned.....
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08-31-2015, 09:44 AM #4Senior Member
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yeah you are right sorry Originally Posted by Jersey_Joe
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08-31-2015, 09:50 AM #5Chief Moderator
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Small potatoes kid. Not a sorry thing. But guessing ? Not the best. Some things call for a good guess. Unfortunately this was not one of em. We just Gota get a little more knowledge in u!!! Lol Originally Posted by Ford Fan#1
5Star tuned.....
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08-31-2015, 10:54 AM #6Senior Member
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yeah. And I've learned ALOT from you and the other members. Originally Posted by Jersey_Joe
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08-31-2015, 11:29 AM #7Chief Moderator
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well that's awesome!!! Always here bud. I was young once too Originally Posted by Ford Fan#1
5Star tuned.....
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08-31-2015, 11:56 AM #8Senior Member
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since you said the truck would be used for interstate driving I would get the 3.55. Maybe even the 3.31. The 3.55 would be better for towing and have more "pickup" then the lower gearing. But the lower gearing will give you better fuel mileage and have less wear on your motor due to the Rpms being lower then what you would have if you had higher gears. But if you want big tires and go mod crazy then you want higher. Originally Posted by haze
Last edited by Ford Fan#1; 08-31-2015 at 12:16 PM.
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08-31-2015, 12:40 PM #9Junior Member
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That's pretty clear, Ford Fan. Joe's 3-5 mpg penalty is a high price tag for more proportional tires. This was a good reality check. BTW: the Mrs revealed that she supports the plan - a surprising plus! Think I'll keep her. (Full disclosure: she gets a new SUV out of the deal).
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08-31-2015, 12:51 PM #10Chief Moderator
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Cool name btw lol. 3.55's are great for all around bud. I've had no probs. pullin. Racin. All good. Good luck. Sounds like u got a keeper btw lol Originally Posted by haze
5Star tuned.....
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