Quote:
Originally Posted by the-moss
UK Gallon is about 25% bigger than a US gallon so 25mpg UK is roughly 20mpg US.
US rates the M3 as 19mpg highway so not that far off.
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Still... 20MPG is a big difference over the long haul. However, still find it hard to believe that the M3 could get 20MPG when most owners are posting in the low 'teens' on these threads...