04-20-2018, 12:01 AM | #1 |
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Bad MPG...am I crazy?
Just got a CPO M235i 8AT Convertible with 28k on the clock and I've averaging 16ish according to the car for 80/20 (city/hwy) driving. With the exception of occasional spirited acceleration I've kept it in comfort or sport(chassis only) and hardly ever go above 3k before it shifts. Haven't even had the car a week yet and already had to top it off.
Am I crazy or what cuz this thing is getting the same mpg as my 5000 pound X6 xDrive35i!!!! What can I do or look at for helping city mpg? What do yall run for tire psi?
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04-20-2018, 12:32 AM | #2 |
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I normally run 35PSI all around on our M240i with M6. In terms of driving around the city, I find the torque is sufficient to be in higher gears a lot of the time. Typically 11 litres / 100km for 100% city (21 US mpg). Today I just drove 600km of which about a third of the distance was non-divided highway that required about a dozen full-throttle passing manoeuvres in 3rd gear, consumption for the tank of fuel was 7.6 litres / 100km (31 US mpg). I do find the B58 engine in the M240i though, is about 20% more efficient in fuel consumption than the N54 engine in our old 135i, I expect the N55 in the M235i would be somewhere in between them.
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04-20-2018, 07:49 AM | #4 |
Das auto ist schnell.
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Drives: 2015 M235i (all stock)
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I've been averaging 17 to 18 mpg on my 2015 M235i with MT. I'm about 90 percent city driving, 10 percent highway on the flat, straight roads of south Florida.
Cheers, Snade
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2015 M235i w MT (all stock)
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04-20-2018, 07:52 AM | #5 |
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Drives: 2015 M235ix
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I drive mostly suburban two-lane roads, usually fairly short trips, and have averaged almost 20 mpg over the life of the car (30K miles), so yes that does seem low. Do you have an independent mechanic who can check out the vehicle? How long have you had the car? You can't trust mpg readings over short intervals.
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04-20-2018, 08:35 AM | #6 |
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Have you reset the counter (hold the button on the left stalk until mpg resets)? A lot of the time, dealers will keep the car running and the MPG plummets - it will take time to get it back up without resetting the count.
My driving is mostly highway and I average about 26mpg. Maybe 28mpg if purely on highways. On track I am at 6.9 mpg.
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04-20-2018, 08:47 AM | #7 | |
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I idle for about five minutes on each of my start ups and it kills my mpg. I’m usually in the 19-21 mpg range. If I use the eco-mode ( w start/stop deactivated ) and watch real-time fuel consumption particularly outside of urban areas my fuel consumption goes up to mid twenties and even higher. Though if I’m doing errands and playing around in Sport mode and driving fast I’ll go through a tank in 2 days. Last edited by overcoil; 04-20-2018 at 08:53 AM.. |
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04-20-2018, 08:55 AM | #9 |
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Drives: 2016 M235i Convertible
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In following the forums for a few years it appears some m235's do well with mpg and some don't. My daily commute is 13 miles each way so I have plenty of time for the engine to come to full temperature and my drive is a mix of expressway, 45 mph city streets with well space lights and urban stop and go traffic. I have the 6 MT and generally run between 2-3K rpm with occasional bursts to 4-5K rpm (because it's fun) while accelerating from a stop. All that said, my real world (actual measured miles/gallons used) is 21-23 mpg. With straight interstate cruising I will get 27-30 mpg depending on weather, traffic and terrain.
Remember too the fuel tank on the 2 series is tiny. I think the tank on my MINI Cooper S was bigger. I generally need to fuel up every 250 miles.
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04-20-2018, 09:17 AM | #10 |
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I was getting 23mpg during winter with snow tyres on for a 60/40 highway/city split.
Just started out on summer tyres again but can't get you a real improvement because I've been enjoying having traction again |
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04-20-2018, 11:43 AM | #11 |
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The tire psi is 38F/46R, some of my trips shorter runs (5miles) and when I put the first tank of gas in i did clear the average mpg.
What can i do to improve it? I bought the car as a CPO so I'm not sure what they could of missed, I'll run a can of seafoam through the gas tank to see if that helps
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04-20-2018, 12:54 PM | #12 | |
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04-20-2018, 01:36 PM | #13 | |
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Drives: 2016 M235i Convertible
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04-20-2018, 03:26 PM | #14 | |
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I came from a 4cyl C300 so I knew it would be less but to get nearly the same at my 2016 BMW X6 with the n55 when it weighs 1/3 less is the concerning part. I do go easy on the pedal 85% of the time and I fill up with 91 because that's the highest in CA.
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04-25-2018, 01:11 PM | #15 |
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Check alignment - easy to get it knocked off settings, common to have this neglected if CPO processing was rushed, and it can really eat into mpg. Also, use the short-term mpg ratings from the info screen (the one that can reset for each trip), not the long-term lifetime cumulative #. And I'd recc using Techron if you have to run cleaning goo (with a tank of no-ethanol, if you can find it) - DK what 'seafoam' is but it sounds a bit scary.
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04-25-2018, 02:10 PM | #16 |
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Something is definitely wrong with your car. I am retired and do 100% city (all 1-5 mile trips with no warm up) with a lot of stop lights and posted speed limits of 30-45. Manual transmission and always sport or sport+ and ave of 19-20 mpg with 93 octane. I do not baby it but take it easy the first few minutes. On the rare occassion of interstate driving its more 26-27 for the interstate of 10-15 miles.
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04-25-2018, 03:31 PM | #17 |
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04-25-2018, 03:52 PM | #18 | |
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04-25-2018, 06:08 PM | #19 |
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14 MPG average and got the car new. Granted I'm always on city streets but for me the gas mileage is atrocious. I've dipped into single digits many times as well.
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04-25-2018, 07:38 PM | #21 | |
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04-25-2018, 07:50 PM | #22 | |
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That’s the way it should work. |
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