[SikhM4CS]

Hello All,

I am running 93 octane gas (NY) and not driving crazy fast, only commuting to work (12 miles back n forth) with normal speed, and Im running average of 15-16 MPG. Is it just me or anyone else experienced this as well? I do have a JB+ Installed if that effects anything.

Let me know your opinions/experiences
Thanks

[RM7]

You have a mod installed that rams fuel down the injectors. I ran a Cobb tuner and could look at the parameters real time with my wrx and it's simply amazing how much fuel and air you can cram in a turbo engine during acceleration, even with a 2.0L block. It's much harder to hypermile an automatic transmission and harder yet with something that makes full torque (in other words "boost") below 2000rpm. These are great for driveability, bad for efficiency. With serious boost coming on at 2500-3000, I was able to shift while accelerating to keep out of this range and boost my mileage significantly. Also, starting and driving the car cold also dumps tons of fuel into the engine that it would not otherwise, which is why short commutes are the worst for efficiency.

You can likely hypermile and save quite a bit more, changing to the economy setting in Idrive and letting the cruise control accelerate. It changes the acceleration with the setting (sport, comfort, etc.).

[SikhM4CS]

Originally Posted by JamesNoBrakes

You have a mod installed that rams fuel down the injectors. I ran a Cobb tuner and could look at the parameters real time with my wrx and it's simply amazing how much fuel and air you can cram in a turbo engine during acceleration, even with a 2.0L block. It's much harder to hypermile an automatic transmission and harder yet with something that makes full torque (in other words "boost") below 2000rpm. These are great for driveability, bad for efficiency. With serious boost coming on at 2500-3000, I was able to shift while accelerating to keep out of this range and boost my mileage significantly. Also, starting and driving the car cold also dumps tons of fuel into the engine that it would not otherwise, which is why short commutes are the worst for efficiency.

You can likely hypermile and save quite a bit more, changing to the economy setting in Idrive and letting the cruise control accelerate. It changes the acceleration with the setting (sport, comfort, etc.).

Yes I agree. Im thinking of driving the car without tuner for acweek and see how much of a difference. I do usually drive in comfort or eco mode while driving locally.
Thanks for the response!

[kern417]

the car makes more boost but if you're not getting into it all the time your gas mileage shouldn't change. but if your commute is all city driving or stop and go traffic then it'll be worse.

[Climb Mode]

MY2017 340 xDrive 6MT running winter tires (PA 4's) doing mixed city/highway. Consistently getting 26ish MPG average. No mods. Very pleased.

[Revelator]

Originally Posted by Climb Mode

MY2017 340 xDrive 6MT running winter tires (PA 4's) doing mixed city/highway. Consistently getting 26ish MPG average. No mods. Very pleased.

Good to know as that's my build to be delivered in Apr and similar commute pattern

[SikhM4CS]

Originally Posted by Climb Mode

MY2017 340 xDrive 6MT running winter tires (PA 4's) doing mixed city/highway. Consistently getting 26ish MPG average. No mods. Very pleased.

That is very impressive for me lol. I didnt know a tuner can bring gas mileage avg that low 😳. I had 328i before, with tuner, never had gas problems.

[RM7]

Originally Posted by kern417

the car makes more boost but if you're not getting into it all the time your gas mileage shouldn't change. but if your commute is all city driving or stop and go traffic then it'll be worse.

You know these cars can do full boost around 1500, right?

[kern417]

Originally Posted by JamesNoBrakes

You know these cars can do full boost around 1500, right?

you know you're not at full boost at partial throttle, right?

[hollandog]

Originally Posted by singhbimmerwala

Hello All,

I am running 93 octane gas (NY) and not driving crazy fast, only commuting to work (12 miles back n forth) with normal speed, and Im running average of 15-16 MPG. Is it just me or anyone else experienced this as well? I do have a JB+ Installed if that effects anything.

Let me know your opinions/experiences
Thanks

the issue isn't the car. it's where you are. nyc traffic kills any MPG.

[kern417]

that was my guess as well. my gas mileage drops 10+mpg when in stop and go traffic.

[XRAVE]

I get around 16-18 mpg city without a tune.

With a tune, for every given throttle input, you'll be using more fuel than without due to boost building quicker. Also with a tune, especially at first, it's going to be more likely that you'll be driving spirited.

If you have 40i and a tune, you shouldn't be too worried about fuel consumption.

[bimmer456]

What kind of gas mileage do you get with comfort and eco pro with auto start stop? I agree that using a jb4 you may see poorer gas mileage than stock or MPPSK which delivers stock gas mileage.

[XRAVE]

Originally Posted by bimmer456

What kind of gas mileage do you get with comfort and eco pro with auto start stop? I agree that using a jb4 you may see poorer gas mileage than stock or MPPSK which delivers stock gas mileage.

I don't think the problem is eco pro vs sport. Those will only adjust throttle position and shift times for those with 8AT. Auto start stop IMO was never made to really help the individual user but more as a whole. Saving .1-.2 MPG is negligible in terms of savings, but when you multiply that times 100,000 cars, it adds up.

The problem with a tune is that the waste-gate is closed longer than normal. Eco pro has no affect on this. I have yet to test it as I just installed the JB+ but I believe cruising at 80 mph, MPG will be less with tune than without.

[opmike]

I have a short commute of around 10 minutes in 100% city traffic with about 9 or 10 traffic lights. I have a JB+ on a freaking 320i and am lucky to get north of 18mpg

[bimmer456]

Originally Posted by opmike

I have a short commute of around 10 minutes in 100% city traffic with about 9 or 10 traffic lights. I have a JB+ on a freaking 320i and am lucky to get north of 18mpg

I would take off the tune for your daily commute or try eco pro with ASS or comfort with the same. If you had a 330e you could commute to work on electric alone. You may be getting similar acceleration as 320i with jb4 as well, though you would be using some gas in that case. 330e also costs as much as a 340i so it depends where your priorities are.

[oarnura]

My first tank with MPPSK was around 16 mpg. But that was a lot of hard accelerations because the tune and exhaust was new and I was having fun making it burble and pop.

With more highway and normal driving but still a little heavy right foot I'm averaging 26-28 mpg. With a short commute and lot of lights you will kill your MPG especially with and aggressive tune like JB4.

[VVlasy]

I get 20 MPG in city with a B58, and I am first at the lights, mainly using sport mode. but 18-20 is no difference, so I would not worry about it...

[BMWalltheway]

19 MPG, 100% city, 10 mile commute each way.

[RPM90]

Originally Posted by singhbimmerwala

Hello All,

I am running 93 octane gas (NY) and not driving crazy fast, only commuting to work (12 miles back n forth) with normal speed, and Im running average of 15-16 MPG. Is it just me or anyone else experienced this as well? I do have a JB+ Installed if that effects anything.

Let me know your opinions/experiences
Thanks

Any cars MPG is related to how the car is driven and the conditions it is driven in.
Having a modest JB+ is not going to alter your overall MPG, UNLESS you are using more fuel, and that again is up to the way the car is driven.

Look at a 330i and a 340i equally optioned with the same AT, which has the same gearing. The 340i has a larger and more powerful engine compared to the 330i. When equally optioned the major difference between the two cars that affect MPG is the weight of the cars, and the power potential.

Use the same driver in each car and drive each car on the same route in the same manner and regardless that the 340i has more power, both cars will end up with very close MPG. The 340i will get a bit less as it is heavier.
If the driver drives each car in the same basic manner, and does NOT use the full power of either engine, MPG will be very close.
Why?
Because either car will be making about the same power needed for the average daily driving. Let's say that maximum power need at take off is about 200hp/200lb ft of torque. Either engine is easily capable of doing that, and in so doing will use about the same amount of fuel.
There is no free lunch with a smaller engine, other than it's potential lighter weight that will have a positive effect on MPG, but that's still quite limited.

The 3 series is a great car to show this as one can option a 328i/330i nearly the same as a 335i/340i and the AT has the same gear ratios and final drive.
That's why even BMW rates the average MPG of either model within 2mpg of each other.

Combined MPG 330i is 27mpg, city 23mpg, highway 34mpg.
340i combined MPG is 25mpg, city 21mpg, highway 32mpg.

However, if a 340i driver were to drive with his foot constantly asking for 300hp all the time, that 340i's MPG would fall even farther down compared to the 330i driver who's constantly asking for his near max power of 240hp.
Why? Because to create 300hp requires more fuel than it takes to produce 240hp.

Point is, even with a tune the cars overall MPG is still based on how the driver drives. If the driver is constantly asking for max or near max of the higher power of the tune, then that car will get lower MPG.
But, if that driver is driving the car in the same manner as before the tune, then the MPG should be about the same.

I have a 340i AT and does about 1.5mpg better than my 335i AT did.
My 15 mile each way commute is mostly non stop country roads and highway. I get about 27mpg during the winter and a bit over 28mpg during the warmer months.
I also run higher tire pressures, which helps a tad with MPG.

City driving can be stop and go in short bursts, and that can really hurt MPG.
It takes a good bit more HP/torque to get a cars mass moving compared to a much lower HP/torque need to keep a car moving at average highway speeds, which is why highway MPG is rated so much higher.
It's not your tune, it's your route in stop and go city traffic.

When you get to take it out of the city onto some some cool country roads and open it up, don't be shocked to see you MPG be low as well as you'll be getting into that power a good bit, and with more power comes burning more fuel.

[hollandog]

anyone notice what's the sweet spot speed for highway cruising on the B58?

[DrifterX]

Originally Posted by hollandog

anyone notice what's the sweet spot speed for highway cruising on the B58?

I can't speak for the B58 with an 8AT but with a 6MT, it's a steady 80km/h (about 50mph) in ECO PRO; I was able to get an average of 6.1l/100km (38.5598 mpg) over a 41km trip. Got this reading with the ECO PRO Analyser App connect to the car while I was driving. It's a bit on the slow side for a typical highway but I damn was impressed as this was only a few weeks after I got the car in fairly cold weather.


I've done ~6.4l/100km at around 100km/hr or so as well... I do quite a bit of highway driving so I've had a lot of trips to figure out what's the most economical speed to save that $ for when I want to push her