Yes those are imperial gallons, which gearbox do you have Chis? I have the dogleg which would be the same as the 4 speed in top. I only ever drive at 60 when I'm on the motorway and that's because I get far less tired and arrive more relaxed when I'm sitting behind a truck rather than getting frustrated at all the idiots driving in the wrong lane, getting in your way, cutting you up and driving too close. The standard of motorway driving in this country is shocking, I might drive at 70 next time just to do a comparison.