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The BMW UK site lists the M2 8AT at 34 UK mpg in the WLTP high-speed test cycle (8.3l/100km, 28 US mpg), so 30 US mpg is not far off that highway cruising speed rating. I've achieved 8.0l/100km a couple of times cruising on the highway.
The US EPA fuel consumption ratings used to be overly optimistic, but with the re-vamp a couple of years ago, they seem to have swung in the opposite direction. The WLTP combined figures are also not representative of fuel consumption at steady cruising in good conditions.
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