Any idea what that would be in U.S. gallons? I heard the UK Imperial
is about 20% more?

46-48 mpg (UK) x 0.80???? = or 36.8 to 38.4 mpg (US)???

Pretty good mileage for a good sized car. The mid size diesel Merc we
can get in the States now gets about the same mileage

My guess is as you break in the engine, your fuel mileage should go up
a bit. I always heard that brand new engines get lower fuel mileage
until they get over 4,000 or so miles. Maybe that is a myth.

How do like it? How is the acceleration?