A Quick Wpg. Question

[norclaj]

When working out your WPG figure, do you base it on US Gallons or UK Gallons???

 

[garuf]

When working out your WPG figure, do you base it on US Gallons or UK Gallons???

US, and then its pretty useless and is the roughest of guides and is particularly useless on anything less than 10us galls.