Around 18-20mpg in town, 22-25 on "spirited" drives in the country, 25-30 on "relaxed country drives, mway, etc
Although an 80 litre tank, the warning light comes on at about 15 litres left, ie about 3 gallons. Feels strange knowing you can safely do another 50 miles once that orange light is on though.
I normally end up doing about 350 per tank, have had it over 400, and I seem to recall someone claiming they had over 500
Gus