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I love the E30 (my last car was an E30) Should've kept the wheels!
I have just worked out the difference between the rolling radius of the old and new wheels (with a tape measure while they were off the car) and 5% is pretty much spot on.
I averaged 56 mpg UK (46 US) on my last tank, but had lots of variables making it dodgy, such as using 2 types of fuel (bio and normal diesel) and changing the wheels toward the end of the tank.
Will be good to see if I get a gain in my next tank of around 5%...
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Will you recoup money spent on mods in fuel saved? see my spreadsheets here
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