I should have noted these were both automatics.

 

Mine is typically off by 2-3. Just today, avg. consumption said 30.2, and actual was 27.5. That's combined, with freeway speeds averaging 73 mph.

 

Mine is the same as yours. My average is 27.5 combined Hand calculated btw.

 

After 22 tanks of gas, I have discovered that my OBC for MPG's is a P.O.S.!

Variance between actual (hand calculated) MPG's and the computer is between about 6% to 12%....very unreliable in my book. My last tank was off by just over 8%; OBC said 34.2 mpg's, but I calculated 31.5. The OBC always seems to be on the optimistic side, too... I guess that MINI is trying to make us all smile, and their thought is that this would be a good way to do it.

Is anyone working on a fix for this? Or is it the brand of sensor/type of program that MINI/BMW uses? Do BMW's have this same problem?

 

Mine was exactly 8% optimistic on the last tank as well . I still wonder how some people are getting 450-500 miles on a tank. I'm no lead foot, and the best I usually get is ~ 375 miles with one bar left.
FYI, I also have a 2002 BMW X5, and the OBC mileage is dead on accurate!

 

Yeah, I have a Lexus with OBC MPG's and it is dead-on too. My wife's Volvo is 1-2% off...no biggie. But the variance on the MINI's is unforgivable. I got 500 miles on a tank once, but usually get upper 300's to lower 400's.

Maybe a silent recall for customers like us (who have nothing better to do) to reprogram the thing?????

 

Hand calculated, I'm getting 29.5 mpg. Computer says 31.1. I'm still happy!

 

Not saying that I liked it better when gas was more expensive... heh heh heh

 

Nice Stats. I'd love to see the same stats for spirited driving in an MCS. I'm thinking the average mpg will be closer to 25

 

I am below the sticker to. I drive a 2008 MCS and I believe it's mainly because of:
1) These numbers are found in a lab
2) I live in an area which is filled with ups and downs
3) Traffic
4) My "spirited" teenage driving behaviour