Bigger Tires, Leveled = Less Gas Mileage
09-24-2010, 03:30 AM
#1
Bodragaz
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Location: Colorado
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Bigger Tires, Leveled = Less Gas Mileage
I just leveled my '05 F150 FX Crew Cab, to accomodate 18" Wheels and 305/65/R18 BFG ATs. Prior to my mods, I was getting 14 MPG in the city... now I'm getting 11.3 MPG in town! I'm considering the Edge Evolution, K&N Cold Air Intake and a Cat-Back Exhaust. Has anyone had any positive experience with these modifications? Better MPG - possibly!?
09-24-2010, 07:23 PM
#2
Formerly "ZCHPRO"
bigger tires always cause a decrease. Did you reprogram the speedometer? Also I did the gotts mod but didn't get a gain because my truck isn't working too well right now. Programmers should help but not that much.
09-24-2010, 07:35 PM
#3
I Like Tires
Do you have them fully inflated? And is your speedo calibrated? Cuz I went to larger tires and its the same as going from a 3.73 rear end to a 3.55 (Not exactly the same just giving an example). Makes your Gear Ratio taller and that gives you better mileage. I havent seen any decrease in mileage and the Edge Evo only made my mileage better.
09-24-2010, 09:18 PM
#4
Senior Member
I just leveled my '05 F150 FX Crew Cab, to accomodate 18" Wheels and 305/65/R18 BFG ATs. Prior to my mods, I was getting 14 MPG in the city... now I'm getting 11.3 MPG in town! I'm considering the Edge Evolution, K&N Cold Air Intake and a Cat-Back Exhaust. Has anyone had any positive experience with these modifications? Better MPG - possibly!?
09-24-2010, 11:34 PM
#6
Bodragaz
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That size tire is close to 34 inches tall but weigh's more then the stocker's. Stop and go driving with larger tires eat's up gas and also your brakes. 2 mpg is about average you will lose with 34 or 35's in the city. Highway driving is not too bad of a decrease because they drop ypur rpm's down at crusing speed's. I would advise a programmer to adjust for the taller tires but a cold air intake may cause you to go with custom tunes. I ran 315x70x17 BFG's for year's and got 13-14 city and 16-18 hwy with the Edge Evo set on level 2 and running 3.73 gear's.
Thanks, Bro!
09-25-2010, 12:39 AM
#7
I Like Tires
Some people say that CAI w/ Edge Evo will run your engine lean and some other people say they run both and they do fine. I don't run both, I dont even have performance exhaust at the moment just the Edge so I can't tell you if it does or not. How to recalibrate your speedo though? You need to buy a speedometer calibrator, or the Edge Evo as it will calibrate your speedo for larger tires as well.
