The downside of a tune

rascalion · 06-21-2012, 10:39 AM

I've had my tune in my car for about a week now and I've noticed a major downside. My gas mileage has gone way down. I used to get ~29mpg on my commute. Now I'm down around ~23mpg.

It's not the tune. It's the driver. I just can't help gunning the car now through gaps in traffic. So much more fun to drive over stock. Anyone not driving this car with a tune is nuts.

rader1 · 06-21-2012, 10:44 AM

You can add to that the "slippery slope." It goes from "well, I'll just get a tune" to 6 months later your FBO installing a meth kit getting a custom dyno tune lol

But its awesome all along the way

JamesM3M5 · 06-21-2012, 10:44 AM

As soon as I read your title I thought the exact same thing you typed! Too much fun to punch it and lose fuel economy. I've been driving around very slowly, accelerating very gently, shifting very low, for the past tank and a half, and I got significantly better mileage (360mi/tank versus 290). But damn, it's hard to stay out of the throttle.

gzim335 · 06-21-2012, 10:57 AM

the most I get is like 200 a tank

STONEY_M5 · 06-21-2012, 11:02 AM

Quote:

Originally Posted by JamesM3M5

As soon as I read your title I thought the exact same thing you typed! Too much fun to punch it and lose fuel economy. I've been driving around very slowly, accelerating very gently, shifting very low, for the past tank and a half, and I got significantly better mileage (360mi/tank versus 290). But damn, it's hard to stay out of the throttle.

Def

Quote:

Originally Posted by gzim335

the most I get is like 200 a tank

You are very lucky my friend

BMWsky · 06-21-2012, 11:07 AM

Quote:

Originally Posted by rader1

You can add to that the "slippery slope." It goes from "well, I'll just get a tune" to 6 months later your FBO installing a meth kit getting a custom dyno tune lol

But its awesome all along the way

Quoted for truth...

zeel · 06-21-2012, 11:10 AM

I notice now when I pass someone, I do it with authority. RIP gas mileage...

rdeterman · 06-21-2012, 11:14 AM

the downside is my tires wear out quicker.. i still havent figured that out haha

GeorgiaTech335coupe · 06-21-2012, 11:20 AM

You think gas mileage is bad now, wait til you try e85.

Loco Goose · 06-21-2012, 02:10 PM

Quote:

Originally Posted by rader1

You can add to that the "slippery slope." It goes from "well, I'll just get a tune" to 6 months later your FBO installing a meth kit getting a custom dyno tune lol

But its awesome all along the way

this.

idrift4wd · 06-21-2012, 02:18 PM

plugs/injectors/coilpacks also go faster too

my mpg isnt too bad, but sometimes im spending 20-30 bucks a day to fill-er up. i dont even drive far

mcpcolas · 06-21-2012, 02:23 PM

funny thing is i dont have a tune, my car is completely stock and im only getting 12.5 mpg
i had the dealer looked at the car twice they keep saying everything is fine. is that normal?
to be honest i do push the car hard once in a while but averaging 12.5 mpg is a killer and my average speed is 17mph

Astephens94 · 06-21-2012, 02:48 PM

Quote:

Originally Posted by mcpcolas

funny thing is i dont have a tune, my car is completely stock and im only getting 12.5 mpg
i had the dealer looked at the car twice they keep saying everything is fine. is that normal?
to be honest i do push the car hard once in a while but averaging 12.5 mpg is a killer and my average speed is 17mph

I would think something must be very wrong here -- do you spend a long time in wall to wall traffic every day??

I personally average 18 - 20mpg, but also have a lead foot and drive more side roads than highway

BigRedAEM · 06-21-2012, 02:52 PM

Just orded JB4 yesterday and bought the car Saturday haha. I've always thought about a JB4 335i and I'm finally getting to do it.

BQTuning · 06-21-2012, 02:52 PM

Quote:

Originally Posted by rascalion

I've had my tune in my car for about a week now and I've noticed a major downside. My gas mileage has gone way down. I used to get ~29mpg on my commute. Now I'm down around ~23mpg.

It's not the tune. It's the driver. I just can't help gunning the car now through gaps in traffic. So much more fun to drive over stock. Anyone not driving this car with a tune is nuts.

Shift before turbo spooling point which is normally 3k RPM. You will see improvements.

Just make sure to reset your MPG clock

mcpcolas · 06-21-2012, 02:59 PM

Quote:

Originally Posted by Astephens94

I would think something must be very wrong here -- do you spend a long time in wall to wall traffic every day??

I personally average 18 - 20mpg, but also have a lead foot and drive more side roads than highway

i do a lot of city driving but no traffic only stop for red lights. i was thinking of getting my injectors clean but the car only has 37k on it . i only use BP 93 oct fuel

spool twice · 06-21-2012, 06:03 PM

Quote:

Originally Posted by GeorgiaTech335coupe

You think gas mileage is bad now, wait til you try e85.

This is very true

spool twice · 06-21-2012, 06:06 PM

My MPG hasn't changed too much if I use straight 93 octane and do highway only cruising (I still can average 33.XXmpg @ 75mph indicated driving from Sarasota to/from Tampa) and that includes stuffy traffic and slowing down for slower traffic passing in the left lane.

When you drive normally, there shouldn't be a change in MPG. I've read that some tunes (such as a procede) that can actually advance may increase gas mileage during cruising states.

benzy89 · 06-21-2012, 06:07 PM

Quote:

Originally Posted by mcpcolas

i do a lot of city driving but no traffic only stop for red lights. i was thinking of getting my injectors clean but the car only has 37k on it . i only use BP 93 oct fuel

The computer can be giving you a shit estimate on your mpg. I remember reading somewhere that the "No Turbo" Map on the JB4 gave better gas mileage, but the computer said that the MPGs were worse.

spool twice · 06-21-2012, 06:14 PM

Quote:

Originally Posted by benzy89

The computer can be giving you a shit estimate on your mpg. I remember reading somewhere that the "No Turbo" Map on the JB4 gave better gas mileage, but the computer said that the MPGs were worse.

I've always noticed the OBC average mpg reading is always low compared to my own calculations as well. It could be that the OBC doesn't account for the roughly 1 gallon remaining in the tank when it reads "0 miles" til empty.

Bakeme521 · 06-21-2012, 07:32 PM

Quote:

Originally Posted by gzim335

the most I get is like 200 a tank

Switch to e85 maps and run a mix, 120 on my last tank...

805beemer · 06-21-2012, 08:35 PM

I usually wait till there's 20-30 miles left till empty before filling up with 5.5 gallons of e85 and 5.5 gallons of 91 and still get 250+ miles till I need to fill up again. And that's with multiple runs over 100+mph. Still a lot better than getting 200 miles out of a full tank of 91 on my old STI.

06-21-2012, 10:39 AM	#1
rascalion Private 4 Rep 60 Posts Drives: 2008 335i E93 Join Date: Mar 2012 Location: Warwick, RI iTrader: (0) Garage List 2008 BMW 335i E93 [0.00]	The downside of a tune I've had my tune in my car for about a week now and I've noticed a major downside. My gas mileage has gone way down. I used to get ~29mpg on my commute. Now I'm down around ~23mpg. It's not the tune. It's the driver. I just can't help gunning the car now through gaps in traffic. So much more fun to drive over stock. Anyone not driving this car with a tune is nuts. __________________ Old car: 2008 335i Convertible w/ PROcede Rev2.5SE // aFe Stage-2 PRO Si Intake // BMS OCC // SmartTop New car: 2017 Ford Fusion Titanium. I got old, married and was given a budget.
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06-21-2012, 10:44 AM	#2
rader1 Banned 70 Rep 2,197 Posts Drives: Cobb Stage 2+ 135i Join Date: Apr 2011 Location: Roanoke, VA iTrader: (0)	You can add to that the "slippery slope." It goes from "well, I'll just get a tune" to 6 months later your FBO installing a meth kit getting a custom dyno tune lol But its awesome all along the way
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06-21-2012, 10:44 AM	#3
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	As soon as I read your title I thought the exact same thing you typed! Too much fun to punch it and lose fuel economy. I've been driving around very slowly, accelerating very gently, shifting very low, for the past tank and a half, and I got significantly better mileage (360mi/tank versus 290). But damn, it's hard to stay out of the throttle. __________________ RRT E92 335i/6MT with stuff and things
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06-21-2012, 10:57 AM	#4
gzim335 Captain 148 Rep 965 Posts Drives: e92 m3 Join Date: Feb 2011 Location: staten island ny iTrader: (4) Garage List 2007/1 e90 335i [2.00]	the most I get is like 200 a tank __________________ e92 m3 dct gintani stage 2+ full ethanol custom pulley and meth kw clubsport,ap racing radical,volk te37sl,akrapovic rear,recaro profi xl,voltphreaks battery
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06-21-2012, 11:10 AM	#7
zeel Lieutenant 14 Rep 579 Posts Drives: 08 AW e92 335i Join Date: Nov 2010 Location: MD/NOVA/DC iTrader: (2) Garage List 2008 bmw e92 335i [7.34]	I notice now when I pass someone, I do it with authority. RIP gas mileage...
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06-21-2012, 11:14 AM	#8
rdeterman First Lieutenant 11 Rep 399 Posts Drives: 2008 335i Coupe 6mt Join Date: Apr 2012 Location: Iowa iTrader: (2)	the downside is my tires wear out quicker.. i still havent figured that out haha __________________ JB4 G5 ISO W/BMS FLASH, FBO, Walbro LPFP, Spec S2+ SMFW
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06-21-2012, 11:20 AM	#9
GeorgiaTech335coupe Lieutenant Colonel 76 Rep 1,883 Posts Drives: Black BMW 335i coupe Join Date: Mar 2007 Location: USA iTrader: (0)	You think gas mileage is bad now, wait til you try e85. __________________ Legal Disclaimer: Anything I or anyone else says about my vehicle on this website(e90post.com or any affiliated or nonaffiliated sites), pertaining to modifications, is only to gain acceptance from my/our peers, and does not actually represent anything actually existing on my car, and thus, cannot be held against me in any issues, i.e. warranty claims, that may arise.
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06-21-2012, 02:18 PM	#11
idrift4wd Brigadier General 149 Rep 3,552 Posts Drives: Three Hundred and Thirty Five Join Date: Jul 2010 Location: Yonkers NY iTrader: (0) Garage List 2007 BMW [7.00]	plugs/injectors/coilpacks also go faster too my mpg isnt too bad, but sometimes im spending 20-30 bucks a day to fill-er up. i dont even drive far
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06-21-2012, 02:23 PM	#12
mcpcolas First Lieutenant 34 Rep 361 Posts Drives: 2009 montego blue 335i xdrive Join Date: Apr 2012 Location: new jersey iTrader: (0)	funny thing is i dont have a tune, my car is completely stock and im only getting 12.5 mpg i had the dealer looked at the car twice they keep saying everything is fine. is that normal? to be honest i do push the car hard once in a while but averaging 12.5 mpg is a killer and my average speed is 17mph
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06-21-2012, 02:52 PM	#14
BigRedAEM New Member 0 Rep 22 Posts Drives: 335i Join Date: Jun 2012 Location: Tampa iTrader: (1)	Just orded JB4 yesterday and bought the car Saturday haha. I've always thought about a JB4 335i and I'm finally getting to do it.
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06-21-2012, 06:06 PM	#18
spool twice Rainbow Racer 1008 Rep 2,539 Posts Drives: BMW M4cs Join Date: Sep 2010 Location: Tampa Bay, FL Area iTrader: (7) Garage List 2019 M4cs [0.00]	My MPG hasn't changed too much if I use straight 93 octane and do highway only cruising (I still can average 33.XXmpg @ 75mph indicated driving from Sarasota to/from Tampa) and that includes stuffy traffic and slowing down for slower traffic passing in the left lane. When you drive normally, there shouldn't be a change in MPG. I've read that some tunes (such as a procede) that can actually advance may increase gas mileage during cruising states. __________________ -Loe P.- Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU \| Pullies + basic bolt-on mods \| 10.861@127.90mph ] Current Car: F82 M4cs \| TT-RS \| On Order: i4 M50
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06-21-2012, 08:35 PM	#22
805beemer Captain 23 Rep 647 Posts Drives: 2008 135i Join Date: Jul 2011 Location: Lompoc, CA iTrader: (4)	I usually wait till there's 20-30 miles left till empty before filling up with 5.5 gallons of e85 and 5.5 gallons of 91 and still get 250+ miles till I need to fill up again. And that's with multiple runs over 100+mph. Still a lot better than getting 200 miles out of a full tank of 91 on my old STI.
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