It is bad to leave Fuel in the Tank?

Untdrums · 02-02-2017, 03:54 PM

Hello All,

I recently had my car coded this past weekend for a number of things and have been wondering this question for a while.

How often is it necessary to make sure you use the fuel in the gas tank? My daily work commute is ~55 miles a day round trip and I don't need to set the REX to kick in before I can charge it again. Thus, I hardly ever use the REX unless it's the weekend.

Thanks,
Josh

krnnerdboy · 02-02-2017, 04:33 PM

not knowledgeable in this, however the Chevrolet volt is programmed to burn the gas every so often to keep it from going bad. I'm sure bmw thought of this as well

MalibuBimmer · 02-02-2017, 08:47 PM

Quote:

Originally Posted by krnnerdboy

not knowledgeable in this, however the Chevrolet volt is programmed to burn the gas every so often to keep it from going bad. I'm sure bmw thought of this as well

More to protect the engine from inactivity. Same with the i8.

The gasoline will deteriorate and lose octane count over time but it would take years for it to go really bad.

I run the ICE every once in a while and burn the fuel down to 1/4 tank. I realize that with the REX you can't do that unless you run down the battery. Nevertheless, I wouldn't worry about it.

r33_RGSport · 02-02-2017, 10:10 PM

It will run a maintenance cycle by itself after about 6 weeks of non use.
I haven't used my REx for only about one month so far.
Before I was playing around with it trying to gauge the mpg on the REx.
I only have mine for about 2 months now.

r33_RGSport · 02-02-2017, 10:11 PM

Quote:

Originally Posted by MalibuBimmer

Quote:

Originally Posted by krnnerdboy

not knowledgeable in this, however the Chevrolet volt is programmed to burn the gas every so often to keep it from going bad. I'm sure bmw thought of this as well

More to protect the engine from inactivity. Same with the i8.

The gasoline will deteriorate and lose octane count over time but it would take years for it to go really bad.

I run the ICE every once in a while and burn the fuel down to 1/4 tank. I realize that with the REX you can't do that unless you run down the battery. Nevertheless, I wouldn't worry about it.

You can code it to allow you manually run the engine. But you have to be at 75% battery SOC to start the engine.

bailyhill · 02-03-2017, 03:27 AM

Hello
About to take over a lease on an i3 REX and am not familiar with the coding thing. Is this something the dealers will do or not? Suspect changing the point where the REX can be turned on affects emissions and would not expect a dealer to do it. Does it affect your warrantee from BMW if you have an outside shop do it? I gather that when you have your car serviced, they may flash everything back to baseline unless you ask them not to. Your experience would be helpful.

Bailyhill

r33_RGSport · 02-03-2017, 09:04 AM

Quote:

Originally Posted by bailyhill

Hello
About to take over a lease on an i3 REX and am not familiar with the coding thing. Is this something the dealers will do or not? Suspect changing the point where the REX can be turned on affects emissions and would not expect a dealer to do it. Does it affect your warrantee from BMW if you have an outside shop do it? I gather that when you have your car serviced, they may flash everything back to baseline unless you ask them not to. Your experience would be helpful.

Bailyhill

Most dealer won't do it.
You can find someone local or I can do it remotely.
You just need a Windows laptop, ENET Cable, and the softwares.

It doesn't void a warranty since you are just turning on an option that is available in the car all along.

But, dealer may reset it if they have to update some firmware in the car.

02-02-2017, 03:54 PM	#1
Untdrums Private First Class 76 Rep 132 Posts Drives: '18 440i GC, '15 i3 REX Join Date: Jul 2012 Location: DFW iTrader: (1)	It is bad to leave Fuel in the Tank? Hello All, I recently had my car coded this past weekend for a number of things and have been wondering this question for a while. How often is it necessary to make sure you use the fuel in the gas tank? My daily work commute is ~55 miles a day round trip and I don't need to set the REX to kick in before I can charge it again. Thus, I hardly ever use the REX unless it's the weekend. Thanks, Josh __________________ 2019 CW i3s BEV 2018 EB 440i Gran Coupe 2015 SO i3 REX lease return 2015 EB M235i Euro Delivery 11/26/2014 lease return 2014 MG X1 sDrive 28i MSport lease return 2011 BS 335d sold
	Appreciate 0 Tweet Quote

02-02-2017, 04:33 PM	#2
krnnerdboy Colonel 190 Rep 2,431 Posts Drives: v10 m6 Join Date: Nov 2008 Location: so cal iTrader: (10)	not knowledgeable in this, however the Chevrolet volt is programmed to burn the gas every so often to keep it from going bad. I'm sure bmw thought of this as well __________________ F80 m3, 997 gt3, 14 ram ctd, f15 x5, drz400sm Gone:z4m, boss 302, c6 z06, m6,z3m
	Appreciate 0 Quote

02-02-2017, 10:10 PM	#4
r33_RGSport General 12966 Rep 18,713 Posts Drives: G09 XM, G05 X5 40, 991.2 T Join Date: Oct 2009 Location: So. Cal iTrader: (6)	It will run a maintenance cycle by itself after about 6 weeks of non use. I haven't used my REx for only about one month so far. Before I was playing around with it trying to gauge the mpg on the REx. I only have mine for about 2 months now. __________________ Email:sales@rgsport.com \| IG:RGSport_USA \| Web:RGSportShop.com PM for Everyday DEALS!! MSS • iSweep • RaceChip • Sterckenn • AutoTecknic • Akrapovic • Vossen Wheels • Eventuri Active Autowerke • KW • H&R • Ohlins • Remus • and more...
	Appreciate 0 Quote

02-03-2017, 03:27 AM	#6
bailyhill Private First Class 70 Rep 168 Posts Drives: '20 X3 30e Join Date: Jan 2016 Location: NorthEast iTrader: (0)	Coding Hello About to take over a lease on an i3 REX and am not familiar with the coding thing. Is this something the dealers will do or not? Suspect changing the point where the REX can be turned on affects emissions and would not expect a dealer to do it. Does it affect your warrantee from BMW if you have an outside shop do it? I gather that when you have your car serviced, they may flash everything back to baseline unless you ask them not to. Your experience would be helpful. Bailyhill __________________ Current: "17 i3 REX; X3 30e History: '67 911S, '72 MB 280 SE 4.5; '74 2002, E21 ('78 320i, E28 ('85 535i) , E36 ('90 325i), 6 Volvos; '14 ForTwo eDrive; '15 i3 REX, F31--'15 328 D Sportwagen; F25 LCI '16 X3 D
	Appreciate 0 Quote