How many MPG's off is my car because of slightly larger tires??
 

Hey guys!

Just wondering how many mpg's my cars tripometer will be off because the VX stock tires are 165/70-13 and I am running 175/70-13...

Thanks in advance, everyone on here has been great!

Here is a circumference calculator on discounttire.com. You might want to try to verify how accurate your odometer is overall. My CRX has 185/60/14s on it which should be about 4% larger in circimference then the stock 13 tires. I used Google Earth to measure about a 30 mile section on my commute to try to see if I was really getting 4% lower mpg then I was calculating, and it turned out the odometer was pretty much dead on with the 14" tires. I guess the stock odeometer is about 4% high.

https://www.discounttire.com/dtcs/infoTireMath.dos

2.54%...is what it says...mind running running it for me to see if I did that correctly...

Thanks!
Colin

Tire calculator says 165/70/13 has a circumference of 69.41 and 175/70/13 is 71.14. This is 1.73" more. 1.73/69.41 is 0.0249 or 2.49% more. The Sunday night football game must be pretty boring to make me want to calculate tire circumferences.

panamacolin -

I used a GPS to calibrate/correct my odometer :

New shoes (aka tires)
https://www.gassavers.org/showthread.php?t=3699

CarloSW2

cool, ill have to try the gps thing