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I agree with most of the comments so far.
Real time MPG feedback is a great help. I only have a vacuum gauge, but will get an MPGuino one of these days.
A well thought out kill switch helped, but I can't put a figure to it.
The best ecomod I did (and can give a hard result for) was fitting taller tyres to raise overall gearing.
I went from 195/50 R15 to 195/60 R15 for just over 5% MPG gain. I'd go to 195/65 R15 next time, but they may not fit under the strut coils.
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