39mpg in sport mode? 35 in normal mode! new owner asking for a bit of advice - MINI Cooper Forum
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Old Jun 7th, 2014, 10:56 PM
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39mpg in sport mode? 35 in normal mode! new owner asking for a bit of advice

HI all

I have recently purchased an 09 mini cooper s with 9k on the clock. Having loved the drive since buying the car there has been a few niggles like with all cars.

1. I get 39mpg in sport mode yet 35mpg in normal? any ideas?

2. a slight hesitation in normal mode on harsh acceleration. is this normal? never owned a mini cooper s before so not sure.

3. when driving about 70mph and you slightly de celerate it feels like it misses a beat really hard to explain. just wondered if this is how the car is or if theres a prob? any ideas?

Any help would be much appreciated.

Thanks
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Old Jun 8th, 2014, 10:18 AM
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Quote: Originally Posted by fameboi (original)
1. I get 39mpg in sport mode yet 35mpg in normal? any ideas?

The problem there is how accurately this can be measured. Even if you run the comparison over several tankfuls for each mode using odometer miles and petrol pump gallons (which is about the shortest distance over which accurate results are possible), you can't be sure the driving conditions were the same for both - a difference of several mpg between two tankfuls that you think were driven the same is to be expected for things like weather conditions, temperature, traffic, etc.

No suggestions for the other two.
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Old Jun 8th, 2014, 10:27 AM
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thanks for the reply. I use the good old fashion calculator to work out the mpg not the on board computer as i know these can be a bit out.

was just curious as all seems a bit odd. i saw a lot of posts where people were only getting 32mpg.
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Old Jun 8th, 2014, 07:03 PM
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Quote: Originally Posted by fameboi (original)
2. a slight hesitation in normal mode on harsh acceleration. is this normal? never owned a mini cooper s before so not sure.

This is one or both of the following:

- The injectors are dirty. Fuel system cleaner (a good one) will help.
- The back of the intake valves are dirty. Cleaning them requires removing the intake manifold and using a walnut blaster (its an official BMW tool, btw). Not cheap, but worth it.

With only 9K on the clock, I doubt if it's the intake valves, but it will need it eventually. Direct injection engines are a bugger that way.

I had to run three cans of injector cleaner through mine before the hesitation problem got better. I used B&G 44K, which lots of people swear by. Not cheap, but it seems to do the trick.
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