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I own a US spec x3 28d or in short a 2 liter turbo diesel. As for mileage, I never experienced anything like 50 mpg, but have reached 39 to 40 mpg on secondary roads at about 55 mph. While I believe the mileage figures mentioned above, but they tend to come from drivers in the UK. I am wondering if a gallon of gas sold there is imperial gallons versus the ones dispensed here. Secondly, do BMW diesels sold in the UK use Diesel Emission Fluid (DEF) as required here? Would these two factors explain the mileage figures in the UK versus the US?
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