R56 Gas Mileage Tanking!
#1
Gas Mileage Tanking!
in the last week or so my gas mileage has gone downhill. (from average 30 MPG to 23-25). i also notice a decrease in performance and pickup at lower RPMs. (1,000-4,000). only thing ive done different is change tires. they are all season potenzas. i also wonder if its the winter gas blend changes causing the drop. does anybody know when stations make/made the change to winter gas?
BTW i have a 2007 MCS with an alta CIA, i would think the cold weather would increase performance.
BTW i have a 2007 MCS with an alta CIA, i would think the cold weather would increase performance.
#3
its weird, the engine seems much less responsive. the get up and go is gone.
#5
It definately sounds engine related. I am no mechanic but I would guess that the engine is running in a rich condition. Common causes could be a bad thermostat or perhaps an O2 sensor. I am surprised that the engine warning light has not come on. I'd visit the dealer and they can handle it.
#7
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#12
#13
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Well.. better than mine.
I continuously get 15-16 mpg on my MCS.
Filter's clean (car has only like 1200 miles on it), I check tire pressure every month, no performance mods, only city driving.
I think the wife has a lead foot. She doesn't like the turbo kicking in at around 2k rpm and she's still not used to it. She gives it more gas before the 2K and it bucks on her (she's driving an auto).
Still... I don't see how she gets that low of a mpg even with that style of driving.
I continuously get 15-16 mpg on my MCS.
Filter's clean (car has only like 1200 miles on it), I check tire pressure every month, no performance mods, only city driving.
I think the wife has a lead foot. She doesn't like the turbo kicking in at around 2k rpm and she's still not used to it. She gives it more gas before the 2K and it bucks on her (she's driving an auto).
Still... I don't see how she gets that low of a mpg even with that style of driving.
#14
#16
Try this sometime: reset your mpg indicator and drive for a couple of miles, very gently, to try to get a high cumulative mpg. Then just sit with the engine idling, as though you're at a red light. You can see the average mpg drop right before your eyes. City driving is terrible on mileage, not just because of engine inefficiency at low speeds and more fuel needed accelerating from stops. It is also impacted by consuming fuel without adding any miles to the numerator of the calculation (mpg), that is, while stopped at red lights.
This is the reason that the European-build MINIs have the automatic start/stop feature that shuts off the engine and restarts it when sitting at traffic lights.
This is the reason that the European-build MINIs have the automatic start/stop feature that shuts off the engine and restarts it when sitting at traffic lights.
#17
#19
gmhl10,
I didn't mean to suggest that resetting the indicator would change anything in regard to gas mileage. I meant that it graphically indicates the impossibility of doing anything much to improve gas mileage when in heavy traffic or city driving. Any car that spends more time sitting than moving will get much worse mileage...unless the engine is turned off when stationary.
I didn't mean to suggest that resetting the indicator would change anything in regard to gas mileage. I meant that it graphically indicates the impossibility of doing anything much to improve gas mileage when in heavy traffic or city driving. Any car that spends more time sitting than moving will get much worse mileage...unless the engine is turned off when stationary.
#20
If it were possible to erase the data from the engine warm-up period...OBC readings would be (on my car anyway) in the mid to high 40s. But since half of my commute is spent w/ the engine still getting to optimal temps, the numbers initially plummet and then rise.
#21
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#25
I get 6 to 8 mpg going up my driveway. It is a long switchback climbing about 400 ft. in altitude in 1st gear at about 15 mph. On a 20 mile trip from town, this can drop the average a couple of mpg. Arrive at the bottom of the drive with an average at about 30 mpg then watch it drop to about 27 as I climb. So, how and where you drive will have a significant effect.
If you only do city driving, take it out on a freeway or highway sometime and blow the cobwebs out.
If you only do city driving, take it out on a freeway or highway sometime and blow the cobwebs out.