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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jan-09-2020, 03:12:49 PM   #1
TTKlaus
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Default Gas mileage observation

I've had my smg convertible for nearly a year. When I first got it I had several fault codes on it. Initially, my mileage was 23-27mpg. I rebuilt the vanos and adjusted the valves. Mileage stayed the same. Next,I replaced the o2 sensors and connected the o2 sensors correctly (they were mixed up). Now the mileage was 22-25. Performance felt the same. Most recently, I changed the oil, oil filter and fuel filter. This dropped the mileage to 20-23. Performance seems slightly better/smoother. Has anyone noticed similar drops in mileage?
The car is mostly driven in light traffic to town (16miles) and around town. Elevation 7000 feet. Long distance driving trips are mostly 300 miles long, very few stops at 60-90mph.
Klaus
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Old Thu, Jan-09-2020, 03:17:26 PM   #2
Drewster
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Default Re: Gas mileage observation

After an oil change? That sounds more like variance in your driving.

Have you changed spark plugs yet?
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Old Thu, Jan-09-2020, 06:49:56 PM   #3
cozmo kraemer
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Default Re: Gas mileage observation

I have no idea how you guys get such high MPG numbers out of this car. On highway only I might be able to squeek out 24mpg...but normal driving it is always around 18-19. I suppose my car is modified and I have a 3.91 rear, which wouldn't help, but that is a big difference.
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Old Thu, Jan-09-2020, 07:26:57 PM   #4
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Default Re: Gas mileage observation

Quote:
Originally Posted by cozmo kraemer View Post
I have no idea how you guys get such high MPG numbers out of this car. On highway only I might be able to squeek out 24mpg...but normal driving it is always around 18-19. I suppose my car is modified and I have a 3.91 rear, which wouldn't help, but that is a big difference.
Tell me about it. I get 13-15 driving very tamely, stock
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Old Thu, Jan-09-2020, 07:40:26 PM   #5
TboneM3
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Default Re: Gas mileage observation

I probably get like 9

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Old Thu, Jan-09-2020, 07:43:31 PM   #6
Aeko
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Default Re: Gas mileage observation

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Originally Posted by cozmo kraemer View Post
... and I have a 3.91 rear, which wouldn't help...
Low gear ratios, especially final drive, will quickly kill MPG.

And no idea what the difference is, but I can easily get 25+ MPG highway going 75 the entire time.
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Old Thu, Jan-09-2020, 07:48:36 PM   #7
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Default Re: Gas mileage observation

Quote:
Originally Posted by cozmo kraemer View Post
On highway only I might be able to squeek out 24mpg...but normal driving it is always around 18-19
Same here but on stock gearing. It's probably my driving because I can never match the MPG numbers that people claim .. goes for my M3, 330xi, and M5, along with my now sold 330i and WRX.
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Old Thu, Jan-09-2020, 08:04:17 PM   #8
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Default Re: Gas mileage observation

Before my spun bearings I got 13-15 in overall driving with a 60-75% of it city type stop & go. On the highway at 75-85 or 90 I can maybe see 21-22 if I go easy on throttle movements. I have a completely rebuilt motor with Lang's lower end kit (wider con rod bearing journals) & I am STILL in the same mileage range on 245-19 front, 275-19 rears @ 35 & 37psi & running 10w60 Redline! I've got maybe 1,500 miles on this build so maybe it will improve some. I ran down to Homestead raceway Sunday and got 21.5 running 85-90 most of the way. It's almost impossible to go slower and not get rear ended! Our M's were never intended to be driven for economy!
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Old Thu, Jan-09-2020, 08:48:23 PM   #9
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Default Re: Gas mileage observation

i could easily get 27mpg highway when my m3 was mostly stock

after switching to a CSL airbox and putting it through various tune and installation iterations i have yet to see over 23mpg
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Old Thu, Jan-09-2020, 10:22:06 PM   #10
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Default Re: Gas mileage observation

Quote:
Originally Posted by cozmo kraemer View Post
I have no idea how you guys get such high MPG numbers out of this car. On highway only I might be able to squeek out 24mpg...but normal driving it is always around 18-19. I suppose my car is modified and I have a 3.91 rear, which wouldn't help, but that is a big difference.
How fast are you driving?
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Discussing Gas mileage observation in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)