Do Cobb or JB-4 tunes kill gas mileage?

S6F · 03-25-2013, 09:43 PM

I know if you want to play, you have to pay. Just want to see what I'm getting myself in to. Thanks for any replies.

Steve Foster
'11 335i cp/mt
soon to tune

ForgedDistributing · 03-25-2013, 09:56 PM

Of course!
Even if the tune itself doesn't kill the MPG with the higher boost levels, the driver will make it worse!

RIDERDIE · 03-25-2013, 10:25 PM

For me it's been minimal. Jb4, catless dp's, dci, and an axle back and I still average 21 or 22. The first few moths I owned the car it was 23mpg. Albeit mostly highway driving and I don't abuse the power just enjoy it every now and then.

avol3xo · 03-25-2013, 11:30 PM

Under normal driving no, I'm still about the same, maybe half a mpg down. When you are on it you aren't gonna get great gas mileage anyway but I dont have time to look down at how much, having too much fun driving!!

M5Rlz · 03-25-2013, 11:52 PM

Quote:

Originally Posted by RIDERDIE

For me it's been minimal. Jb4, catless dp's, dci, and an axle back and I still average 21 or 22. The first few moths I owned the car it was 23mpg. Albeit mostly highway driving and I don't abuse the power just enjoy it every now and then.

Same lol (cobb)

drallafi · 03-26-2013, 05:02 PM

Quote:

Originally Posted by avol3xo

Under normal driving no, I'm still about the same, maybe half a mpg down. When you are on it you aren't gonna get great gas mileage anyway but I dont have time to look down at how much, having too much fun driving!!

This.

Drove to Vegas from AZ last week, got around 26 mpg. Cobb S1 aggressive.

PR3CI5N · 03-26-2013, 05:16 PM

All depends on how much of a lead foot you have. Just installing it won't affect your gas mileage.

badblkX6 · 03-26-2013, 06:19 PM

As everyone said it will probably go down a little, but well worth it. Depends on how you drive and how heavy your foot gets.

I get on mine quite a bit and rarely go under 21 mpg.

melloww22 · 03-26-2013, 07:08 PM

Quote:

Originally Posted by stevefoster

I know if you want to play, you have to pay. Just want to see what I'm getting myself in to. Thanks for any replies.

Steve Foster
'11 335i cp/mt
soon to tune

not as much as your right foot... I get avg of 19mpg

wdlfbio · 03-26-2013, 10:23 PM

JB4 stage2, map1. I lost 1mpg. At 23.4 now. Mostly hwy miles-124 round trip

M5Rlz · 03-26-2013, 10:26 PM

FBO mods that aren't tightened correctly kill cars

03-25-2013, 09:43 PM	#1
S6F First Lieutenant 95 Rep 335 Posts Drives: '19 540ixMsport Join Date: Aug 2010 Location: Central NJ iTrader: (1)	Do Cobb or JB-4 tunes kill gas mileage? I know if you want to play, you have to pay. Just want to see what I'm getting myself in to. Thanks for any replies. Steve Foster '11 335i cp/mt soon to tune
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03-25-2013, 09:56 PM	#2
ForgedDistributing Lieutenant 25 Rep 561 Posts Drives: FBO N55 >:) Join Date: Apr 2009 Location: Florida/Michigan iTrader: (3)	Of course! Even if the tune itself doesn't kill the MPG with the higher boost levels, the driver will make it worse! __________________ PH: (616) 914-6677 FAX: (305) 255-5446 Contact me for exclusive forum and wholesale pricing! Email: Sean@Forgeddistributing.com Site: http://www.forgeddistributing.com/
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03-25-2013, 10:25 PM	#3
RIDERDIE First Lieutenant 17 Rep 329 Posts Drives: 12 f30 n20 Join Date: Oct 2012 Location: VIRGINIA BEACH iTrader: (1)	For me it's been minimal. Jb4, catless dp's, dci, and an axle back and I still average 21 or 22. The first few moths I owned the car it was 23mpg. Albeit mostly highway driving and I don't abuse the power just enjoy it every now and then.
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03-25-2013, 11:30 PM	#4
avol3xo Captain 59 Rep 733 Posts Drives: 2008 E92 M3 Join Date: Jul 2012 Location: Atlanta, GA iTrader: (1) Garage List 2008 BMW [0.00]	Under normal driving no, I'm still about the same, maybe half a mpg down. When you are on it you aren't gonna get great gas mileage anyway but I dont have time to look down at how much, having too much fun driving!! __________________ 2011 BMW 335i E92 Vermillion Red, 6MT [SOLD] 2008 BMW M3 E92 Alpine White, 6MT
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03-26-2013, 05:16 PM	#7
PR3CI5N need4speed 510 Rep 1,903 Posts Drives: 2010 E90 M 335i Join Date: Jun 2010 Location: West Coast iTrader: (24)	All depends on how much of a lead foot you have. Just installing it won't affect your gas mileage. __________________ N54
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03-26-2013, 06:19 PM	#8
badblkX6 Captain 64 Rep 772 Posts Drives: 2014 X6 35i Join Date: Sep 2011 Location: South Jersey iTrader: (9)	As everyone said it will probably go down a little, but well worth it. Depends on how you drive and how heavy your foot gets. I get on mine quite a bit and rarely go under 21 mpg.
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03-26-2013, 10:23 PM	#10
wdlfbio Captain 68 Rep 796 Posts Drives: 2013 4S, 2015 3500 HD Dually, Join Date: Dec 2006 Location: Maple Valley, WA iTrader: (1)	JB4 stage2, map1. I lost 1mpg. At 23.4 now. Mostly hwy miles-124 round trip __________________ '16 235i '15 3500 HD Dually '13 C4S
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03-26-2013, 10:26 PM	#11
M5Rlz Colonel 249 Rep 2,202 Posts Drives: R8, f10m59(Rip), m4, GTR Join Date: Feb 2013 Location: MD iTrader: (3)	FBO mods that aren't tightened correctly kill cars
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