My JCW is putting out over 40mpg, I reset the mpg reader over a week ago and checked it today and it reads 41.2 mpg? This cannot be correct surely?

 

usually the obd reader is off by 2 mpgs or so and I based it from my own calculation from the pump versus the obd. how i calculate it, i fill up the car and drive it until it requires another fill up.. at the pump, i record the number of miles driven from the last fill up, e.g. 500 miles and the total gallons pumped, e.g. 14.235 gallons. so the equation should read 500/14.235 = XX.XX mpgs. just a quick...

 

Cheers I'll do that!

 

Over 20,xxx miles I have averaged 30mpg with a fairly heavy foot.

 

^Right about what I get ^


Get her out on the highway and it goes up to probably 36 MPG

 

^^^ Me too, at 5,000 miles.

 

Agree with iamwiz82 and I'm at 22k+.

 

between 28-29 on my R59 JCW.

 

Same here in town with AC. Just about 1-2 MPG less than my 2007 MCS so far.