Fuel consumption and tyre/rim size
Thread Starter
Newbie
Joined: May 2017
Posts: 3
Likes: 0
E-Class W213
Fuel consumption and tyre/rim size
I'm receiving my new W213 in the coming months. I just wanted to ask people who have changed their tyre size or rim size what the difference has been.
I have some experience with my current Audi A6. I have gone from 245/45/R18 to 255/40/R19. My fuel consumption went from 56 MPG (5 liter/100km) to 50 MPG (5.7 liter/100km).
Do you have any experience with changing tyre/rim sizes? And what were the sizes before, what were they after and what is your MPG difference?
I have some experience with my current Audi A6. I have gone from 245/45/R18 to 255/40/R19. My fuel consumption went from 56 MPG (5 liter/100km) to 50 MPG (5.7 liter/100km).
Do you have any experience with changing tyre/rim sizes? And what were the sizes before, what were they after and what is your MPG difference?
MBWorld Fanatic!
Joined: Nov 2014
Posts: 5,386
Likes: 1,107
.
First, how are you measuring distance? The vehicle odometer is not correct unless you had it re-calibrated to accommodate the tire change. The new tires rotate ~767 times per mile whereas the old tires rotated ~778 times per mile. Rotations per mile can vary depending on the specific tire manufacturer and model. Other tire characteristics such as rolling resistance also affect mileage. A good tire reference site is tiresize.com.
Thread Starter
Newbie
Joined: May 2017
Posts: 3
Likes: 0
E-Class W213
First, how are you measuring distance? The vehicle odometer is not correct unless you had it re-calibrated to accommodate the tire change. The new tires rotate ~767 times per mile whereas the old tires rotated ~778 times per mile. Rotations per mile can vary depending on the specific tire manufacturer and model. Other tire characteristics such as rolling resistance also affect mileage. A good tire reference site is tiresize.com.
MBWorld Fanatic!
Joined: Nov 2014
Posts: 5,386
Likes: 1,107
.
You are comparing miles from the smaller tires and different miles from the larger tires.
Rolling radius is also different and is influenced by sidewall stiffness. In addition 7/10 liter is a very small amount compared to tank size. A full tank can easily vary in quantity by several liters.
To be accurate fuel should be measured in units of mass, not volume.
Rolling radius is also different and is influenced by sidewall stiffness. In addition 7/10 liter is a very small amount compared to tank size. A full tank can easily vary in quantity by several liters.
To be accurate fuel should be measured in units of mass, not volume.
