Evidently they weight them dramatically differently. And it was definitely the 1 liter petrol version on both sites: the diesel Smart only has 54 HP, and would be a completely different comparison.

...or you could go to www.smart.com or uk.smart.com and see that, today, the exact same 1 liter gas engine producing 70 HP (though the UK site lists it as 71 HP), with exact same torque figures (once you convert units) has a US mileage figure that's two-thirds what the UK site claims.

MPV = mpg. Android virtual keyboards give me a sad.

A Smart ForTwo with the 1-liter engine (the only size available in the US) is EPA listed as getting 34/38 mpg, averaging 36 MPV. The same car with the same engine on Smart's UK site as getting 4.2-4.3 liters/100 km, equivalent to 56 mpg US. Same basic car, same engine, very different mileage ratings.

Third try posting:

What year's your Bug? I've got a '66, though mine's hardly stock anymore (I'm running around with a 2054cc, for starters)

It's...it's beautiful!