Rince

Heya peeps,

Been reading other threads on remapping and it is something I am considering.

However, I am struggling a little to find out if people really do see an increase in MPG? This is my main reason to look at it. Extra power is nice but I do quite a bit of town driving and whilst I dont see much better than early to mid 20's stopping and starting, I am keen to know if this changes at all?

Basically, I wouldn't be too fussed even if it stayed the same, but if I were to lose any MPG, then it would be a waste for me

I also have a long drive every other weekend to pick up my little lad and to conserve fuel a little here, I don't tend to belt along and prefer a steady pace. Would I see an increase in MPG here? Or maybe a slight decrease?

Really struggling for the right answers here so hoping anyone can help.

Thanks,

Andy

acuteperformance

Don't get it for the sole purpose of MPG. It will stay about the same as long as you drive the same.

Rince

Well, I also heard on an auto it improves the general driving experience and was also thinking about this - but not a performance thing for me really - I don't get too many chances to open her up in the traffic I tend to sit in

Banstead

I agree it would improve the driving experience, but surely we all have done science at school?
Faster acceleration burns more fuel, so if you drive 100 miles and don't accelerate again it would make no difference to fuel consumption.
Or have I missed something?

acuteperformance

Well if you install crappy software, the fuel mappings could be changed so it's burning more fuel even when you're not accelerating.

Banstead

It's good to be provocative to incite debate.
I am also thinking of remapping, and accept that extra performance would generate more power and hence fuel consumption.
But is it real that fuel consumption could be reduced?

acuteperformance

don't quote me as i could totally be wrong...

my guess is companies can claim fuel reduction because they are leaning out air/fuel to gain more power. obviously more tweaking is involved but i'm sure that's one of the reasons why MPG is increased.

Techno79

If you are getting the remap with the primary reason to save money on fuel then you may want to do some calculations of how much you will save. I think the MPG saving will take a long long time to recoup the cost of the remap. E-maps and DMS have both quoted me around 10% increase in fuel economy. Just my 2p worth.

Rince

That is a very good point - say ?300 on a remap... at say 2mpg, that is a lot of milage before I notice a difference. However, I also have to think that if there is more power there, then when I put my foot down, I will be burning more fuel and therefore will be more cost in that respect.

Don't get me wrong, I am not a total tightwad, but I don't like spending money without looking at what other costs I will incur

Techno79

I have never had any remap on any of my cars and I've never owned a BMW (although this will change soon I hope) so I cannot speak from experience. My feeling is that getting a remap will overall cost you more because you will be tapping into the extra power a lot more which will use more fuel. The better MPG is achieved when cruising on the motorway so it will be great for those long weekend drives if you do any. Having said that, the extra power from a remap may put a big smile on your face which might be worth ?300