Welcome to ecomodder.
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Originally Posted by DirtyTorquer
I am slowly starting to do things to my daily driver (2003 E46 320D touring) to see just how far up the MPG ladder I can get it.
At the moment I see a rough average of 56 UK MPG (46 US MPG) to work and back...which I think is not too bad considering I work in London...
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What kind of hypermiling techniques are you using already ?
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com
Lower speed, coasting (even with engine on) and low rpm will already get you quite a long way.
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While I could get the ECU remapped for economy...
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It's unlikely to be worthwhile - while it may improver your FE a bit, its unlikely you'll get the investment in the remapping back in reduced fuel consumption.
Changing the way you drive gives a far better RoI
Weight reduction will help in city driving - throw out anything you don't need on a day-to-day basis. If you already have roadside assistance, you might just as well kick out the spare tyre and jack.
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The next project for the car is a full aluminium composite sheet under tray, with lourves for cooling where needed and a diffuser to follow the existing lines of the tail end of the car.
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Do you do enough distance at speed to make this effective ?