[dfeldt91]

I got my lug bolts for the new rims today so I've also got larger tires and rims on. Aside from the faster acceleration I did notice that I am using less gas by checking the Torque app for fuel economy. This was in urban driving with less stops up to 40 mph.

Another thing to think about is deceleration cutoff.....

If you don't know what that is: Deceleration cutoff is where the car will turn off the fuel flow when the accelerator is not pressed and RPMs are above a certain number, usually about 1600, so the car just coasts in gear but uses no fuel. Not sure if your car has this feature but with larger tires the engine will be spinning less for a given speed effectively changing when you will enter deceleration cutoff which may negatively affect the MPG. I did notice that in certain circumstances where I would normally be in Decel mode I was still using fuel. Instead of having no fuel flow I would see that I was getting roughly 60 MPG while coasting meaning I would have to downshift to second which would cause the car to slow down too quickly. It was late and I may have had my foot on the pedal while coasting so it might have registered that and kept it out of decel mode so I will have to test it in the next couple days.

This is with 195/60/14 --> 195/60/15 tires and rims.


Let me know how you get on with the narrower tire. I'm thinking about heading to the junk yard to grab some narrow taller 14's for my steelies.