I live in the UK and at the price of fuel over here (6 uk pounds and 22pence  for a uk gallon on 28th April11) I have really bought the ultra gauge  to try and improve the MPG on my Smart, currently 55 MPG.
It occured to me that the unit is calbrated for the USA so it must be calibrated for use on the US gallon, now in the UK we use the Imperial gallon which is bigger than a US gallon, so that will screw up the calibrations, or will it ?
if i always tell the ultragauge  the quantity of petrol i put in the tank is in "gallons" how will it know they are imperial gallons?, because 1 gallon unit is a 1 gallon unit surely it doesent matter if its a US Gallon or an Imperial UK Gallon to the ultragauge, or am i wrong ?
does anybody  know ??