[hallabusa]

Hi all,

First off - hello. This is my first 'real' post on this forum after lurking for a while and I'd just like to say that this forum has been both informative and amusing over the last few months that I've lurked (I've posted a brief intro in the 'newbies' setion).

Anyway, on Monday SWMBO and myself went from out home town in West Wales to Coventry and I thought that I'd try and get as much MPG out of my 320d as realistically possible throught the journey without sacrificing air con etc. On the way up (circa 185 miles) the car averaged 69.5mpg according to the OBC!!! I must admit that I drove like an absolute shandy drinking big grils blouse (not that theres anything wrong with shandy or blouses - they are just not my thing) keeping to less than 2k revs and mostly leaving the cruise control manage the speed (set to 60 mph!!). Really difficult to do, but after the first hour I became accustomed to looking at things in a different light, at times even holding a conversation with the wife.

On the return journey, the OBC reported a average of 64.something as I now went up to as much as 70mph!!!

My point is I dont know how accurate the OBC actually is, but given the increasing cost of fuel higher mpg is do-able, although it's really difficult.

I've been toying with getting a 335, but that'll be another thread as I've a few questions to put to you guys.

Thanks for reading.

[squeezebm]

Top MPG if thats your thing

Welcome Pal

[gr4z]

Blimey that is good. Before I fitted my spider box I was getting at best 44.6 - but that possibly down to my driving style

Now with a spider, I am getting 47 but I dont trust the digital readout now with a box fitted.

[g9sBMW]

here in the states, if I use cruise control in my daily commute (20 miles to and from work) I can avg 32 MPG.

If i drive without the cruise control it goes to 24.5

[matlough]

With a 335i I get about 24-29 MPG depending on roads and driving style.

All in all I get between 300 -410 miles per tank.

Not bad for a 300BHP car!!

[gIzzE]

Originally Posted by hallabusa

......at times even holding a conversation with the wife.

[Yahoo]

Originally Posted by matlough

With a 335i I get about 24-29 MPG depending on roads and driving style.

All in all I get between 300 -410 miles per tank.

Not bad for a 300BHP car!!

400 miles to a tank is the most I have achieved with my 335i (boring as hell though). This worked out at just under 31mpg. On average it will do 350 miles to a tank full, circa 27/28 mpg.

Not bad really.

[tmarshall57]

On my weekly trip to/from Newbury I average 45mpg which reduces to 38/39 if I include weekend mileage.

Trips to Glasgow where the risk of traffic jams on the M6 are much reduced - therefore higher average speed (but not mad enought to get caught) result in 41/42.

Do those of you using tuning boxes or having remaps all notice an increase in fuel economy i.e. could one justify the purchase purely on economy grounds

[recalluk]

320i Here ... quite pleased with mine lately, managed 37.4 MPG on the 3 hour run to brum, no cruise used but making sure I was careful just to see what I could get.

[gr4z]

Originally Posted by tmarshall57

Do those of you using tuning boxes or having remaps all notice an increase in fuel economy i.e. could one justify the purchase purely on economy grounds

Trouble is you cannot rely on the computer giving you an accurate MPG figure after fitting a box. Next time I fill up I will see how many miles I do on a tank full. Before a Spider I was getting ~600 with 44.6MPG.

[booforty]

Going for my first motorway cruise in the M tomorrow so I'll be interested to see what it gets!

[GarryF]

I'm at 17.4 this week, half way through a tank, when I try I get 22mpg

[335DJim]

Originally Posted by tmarshall57

On my weekly trip to/from Newbury I average 45mpg which reduces to 38/39 if I include weekend mileage.

Trips to Glasgow where the risk of traffic jams on the M6 are much reduced - therefore higher average speed (but not mad enought to get caught) result in 41/42.

Do those of you using tuning boxes or having remaps all notice an increase in fuel economy i.e. could one justify the purchase purely on economy grounds

Just done B'ham to Bristol twice this week in my 335D running a ChippedUK map, clear run on cruise at 84MPH = 47.8MPG - I zero'd the OBC once at cruising speed and switched off cruise at the NEC in B'ham so no speed up or slow down at either end and I was on cruise the whole way (late at night)

I reckon the remaps frig the OBC - not convinced on the MPG to be honest so its probably academic..

Does the OBC take throttle pedal position v speed to work out consumption? - if it does this is where the frig happens. The map definitely reduces the distance you need to depress the pedal to get a certain amount of power over stock..

[E92-Lighting]

how do you figure max MPG?

[Ti Rich]

Originally Posted by 335DJim

I reckon the remaps frig the OBC - not convinced on the MPG to be honest so its probably academic..

With a remap the OBC is normally correct, tuning boxes tend to give over optimistic OBC readings!

[Porscha!]

I gave up with MPG when I was told by BMW my E46 330Ci was the worst they'd ever seen - for MPG, lol!

They couldn't believe it I thought 18-20 was fine and perfectl acceptable out of a 330, they said that was worse then most E46 M3s, I just told them I drive my car as intended

[alisayyah]

Around town my 335i with SSTT averages about 16mpg!! Thats about 160 miles a tank!

You're very lucky!

[OriginalFrak]

If I ever get more than 24MPG then I'll know I'm really getting old....

[booforty]

I was surprised by the MPG from my journey today (mostly motorway) between Bristol and London. Not bad for a 4.0 V8...

[PhilR]

Originally Posted by tmarshall57

On my weekly trip to/from Newbury I average 45mpg which reduces to 38/39 if I include weekend mileage.

Trips to Glasgow where the risk of traffic jams on the M6 are much reduced - therefore higher average speed (but not mad enought to get caught) result in 41/42.

Do those of you using tuning boxes or having remaps all notice an increase in fuel economy i.e. could one justify the purchase purely on economy grounds

Had my 330d remapped 3 months ago. MPG is now at 35.3 after about 3000 miles since map. Prior to this long term MPG had dropped from 36.6 to 34.2 but this was due to a change in my daily commute. I would say that the MPG is marginally better with the map (1 to 2 mpg at best) but just can't help giving it the beans that bit more which is having an adverse effect.

PhilR

[Scoot]

I've just managed an average of 44.9 mpg from my 335D which has also had the remap. I've now done 32000 miles in her. This is the best all-round car i have ever owned .