1st Gen R53 Cooper S Most liked posts in thread: Mileage change after a pulley mod

For me it decreased a bit at first. I think that is because I had to keep using that new found power. Once used to the power I'd say it is roughly the same. My highway mpg is 30-31 around town I see 26mpg.

I am running a 15% pulley....

 

Mine decreased because I have more power and much more FUN.
:devil::lol:

 

I have the same problem.

Now if only I could keep my foot out of it, then I'd better mileage. But we know thats not gonna happen.

 

I didn't notice much of a change either. I get 24-26 mpg. Most of my driving is to and from work, a 26 mile trip, of which 20 is interstate.

 

We find customers usually get about the same mileage. A few that drive like grandma all the time actually saw a slight increase in mileage.

 

Best bang for the buck mod on an R53 there is.

 

I get the best mileage when my car is sitting in the garage because as soon and I take it out and go hammer it I average about 13-19 MPG.

 

On track my mileage gets very low, but on the road while behaving myself 26mpg - 31mpg is pretty good for my little fun wagon.

 

All one needs to do is head to the local parts house & buy the correct NGK. You'll save yourself some bucks.

 

I've stopped checking, it's not going to make a change in my style so I don't bother anymore.

 

I think your big injectors & tune have more to do with your mileage or lack of same than the pulley does. Then there is that size 12 throttle foot. :wink:

 

What is the # on the spark plugs you guys recomend when doing this mod.? I have heard that dropping the temp range will make a few more little winnies out of it. Also it is time for a tune up since I have hit 105k and I was wondering what wires and coil ppl have used and what works well?

 

Wires, take your pick.
Coil, stock. (if yours is working fine, don't worry about it.)
Plugs, 1 step colder than stock. (NGK's are BKR7EIX)

 

I'd recommend the JCW spark plugs as they are the most reliable and fit right.