Taller tires affect MPG
#1
Taller tires affect MPG
Hello y'all,
just wondering about changing to taller tire to get better fuel mileage. I have a frind that went to taller tires on a 7.3 power straoke that is chipped and is getting 22-24 highway with his rig. I have a 6.7 Cummins that has been fully deleted and using the Smarty Sr programmer. I'm running my stock 17's but just wnadoring if I would have any trouble fitting 35's on my rig? It is stoc with no lift kit on it. Any help would be appreciated.
just wondering about changing to taller tire to get better fuel mileage. I have a frind that went to taller tires on a 7.3 power straoke that is chipped and is getting 22-24 highway with his rig. I have a 6.7 Cummins that has been fully deleted and using the Smarty Sr programmer. I'm running my stock 17's but just wnadoring if I would have any trouble fitting 35's on my rig? It is stoc with no lift kit on it. Any help would be appreciated.
#2
Yes it will result in different MPG. you are essentially changing the gear ratio in the rear-end. the truck will travel farther with each revolution of the axles because the outer diameter of the tires is larger. One thing I would ask about you friend is how he figured his MPG. if he is chipped with larger tires, is he going by the readout on the truck for what MPG he is getting? Does he have the speedometer compensated to adjust for larger tires? if he has a programmer on it then keep in mind that power is added by lying to the trucks ECU to get it to adjust timing and fuel rates so any readout that the truck gives is derived from false input. the overhead readout on my 01 5.9 CDT with my old Hypertech tuner on stage 3 would say I was getting about 24mpg when I was truthfully getting about 12 and that my 30 mile ride to work was actually 36 miles.
#5
Well a wider tire will give you less mileage. A taller tire will give you better mileage on the highway, but around town the more torque required and the additional mass will hurt fuel mileage. Also it depends on just how much bigger...bigger rims? or taller tire, you kinda want to keep the sidewall the same height as stock. Now if your going for 22.5 rims and heavy truck tires all bets are off.
#6
My next tire will be the 285-75-18 Toyo or Nitto.
My G-56 0.79 final drive yields the same as a 4.10 auto so it should slow down the tach some.
Our '98 Honda Accord 4sp manual barely got 26mpg city/highway combined
My friend's 2000 4wd F-250 with factory blades and $6.5K of Bank's barely yields 17 mpg highway.
My G-56 0.79 final drive yields the same as a 4.10 auto so it should slow down the tach some.
Our '98 Honda Accord 4sp manual barely got 26mpg city/highway combined
My friend's 2000 4wd F-250 with factory blades and $6.5K of Bank's barely yields 17 mpg highway.