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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > n55 gas milage .. general thoughts



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      02-06-2014, 10:36 PM   #1
Andrewe92
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n55 gas milage .. general thoughts

Hey guys so my n55 has 26,000 miles on it.. recently I have been wanting to squeeze a better mpg figure out of it. I seem to be getting about 21 mpg at the moment, which isn't that great considering I have been driving like a grandma lately! I have a ppk but I have my jb4 stage 2 set to map 1 as my daily map. I don't really go into "boost range" or give much throttle.. it's also worth noting that I am reading my mpg average off the idrive screen (cic) .. what can really help reach at least around 24 or 25mpg? I only have the tune! would an intake help? the b3 trans flash? what else.. I run 93 oct.
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      02-06-2014, 10:47 PM   #2
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Alpina tcu flash will increase mpg, I saw the increase as soon as I did it to mine.
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      02-06-2014, 10:49 PM   #3
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Quote:
Originally Posted by Jacblack
Alpina tcu flash will increase mpg, I saw the increase as soon as I did it to mine.
Could you throw some numbers at me in terms of mpg before and after ?
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      02-06-2014, 10:54 PM   #4
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Well stock with the reflash I saw 30 at times. With Cobb stage one it was about 26 or so. Now I'm tryna track it with my Protune.
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      02-06-2014, 10:56 PM   #5
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Quote:
Originally Posted by Jacblack
Well stock with the reflash I saw 30 at times. With Cobb stage one it was about 26 or so. Now I'm tryna track it with my Protune.
Wow 30?! That's really high , I'm guessing you are just using the number off Idrive ?
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      02-06-2014, 10:57 PM   #6
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Yeah but even when I did the math it was pretty much spot on. It's all how you drive with the reflash you are in 6th gear at like 35 mph, keeping the rpms lower seemed to help
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      02-06-2014, 11:00 PM   #7
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Yeah, reflash shifts like crazy. Butter smooth, you only notice thru rpm/engine noise. Definitely conservative when light throttle in D with B3
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      02-06-2014, 11:03 PM   #8
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Quote:
Originally Posted by tc535i
Yeah, reflash shifts like crazy. Butter smooth, you only notice thru rpm/engine noise. Definitely conservative when light throttle in D with B3
I can't wait to flash my car, anyone know much about Intakes and mpg?
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      02-07-2014, 07:28 AM   #9
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Honestly if you are driving around town it probably won't get much better regardless of what you do. Highway cruising is completely different as far as mileage.

As soon as you give this car gas, the turbo spools. Gas mileage will correspond with how heavy your foot is we all know. If the turbo(s) is working, your mileage will suffer.

Let's not forget the impact of inflation in your tires or the season!
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      02-07-2014, 07:33 AM   #10
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I'm getting around 24MPG on the highway. At first I figured there was something wrong with my car because my old tuned E90 328 was getting over 30MPG on the highway.
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      02-07-2014, 07:57 AM   #11
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N54 jb4, CP, dwn pipes, RB pcv, I get 22.1mpg city 35.4mpg highway. Only fill up with Sunoco 93.
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      02-07-2014, 11:39 AM   #12
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I just have the PE and drive mostly HWY, I average 28-29 mpg. I love it!
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      02-07-2014, 11:40 AM   #13
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Quote:
Originally Posted by Infamy
N54 jb4, CP, dwn pipes, RB pcv, I get 22.1mpg city 35.4mpg highway. Only fill up with Sunoco 93.
I'm also around 22
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      02-07-2014, 12:06 PM   #14
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It varies a ton by driving conditions. In this crappy cold weather I am getting ~21mpg totally stock in the city, but can get over 30mpg if I am nice to it on the highway. If you figure it out the cost of gas isn't a very big deal. Just drive it and have fun!
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      02-07-2014, 02:55 PM   #15
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I average 31mpg in my 6MT with intake and map 5 on the highway. That's calculated at the pump, mixed driving.
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      02-07-2014, 06:43 PM   #16
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In the city where the temps here have been a constant -20c to -35c i get about 10-12 mpg driving like a granny! On the hwy last week driving 115kph i was getting 28-30 mpg. The constant frigid temps totally kill mpg with my car, it rarely reaches full operating temp
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      02-07-2014, 07:24 PM   #17
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My n55 gets better mpg than my n54 tuned 135. Its actually really good on gas. Way better than I thought it would be.
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      02-08-2014, 08:29 AM   #18
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I've been tracking my mileage on fully.com since new and I average 22mpg in mixed driving. Personal best on a tank was close to 31 on a highway trip. N55 335 gets better mileage than the wife's 328i.
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      02-08-2014, 11:13 AM   #19
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N55 FBO with Jb4. I get about 31 highway.
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      02-08-2014, 12:24 PM   #20
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keep it coming guys!! It seems like 31mpg at highway is the most we'll see
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      02-08-2014, 12:37 PM   #21
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How the hell are you guys getting such high gas efficiency. I'm getting like 18mpg with no real engine mods just PPK and PE exhaust. 6 speed manual. But then again I drive like a typical BMW asshole.
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      02-08-2014, 01:00 PM   #22
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I am in 6 all the time. With the low end of this engine its like u can go from 1 to six. I use six even in town at like 30.
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