fuel tank capacity on Evoque, the book says 57 lt, however using up to the empty on the fuel gauge, and down to the last 8% on the gauge, it only takes about 45lt to fill it. does this mean there is still about 10lt in the tank. if so is it usable? I live in the Northern territory and travel long distances in on go or day, and would like to have a greater range. I just returned from a trip from Darwin to Alice Springs (1,600 km each way). when I purchased it I assumed I could use all 50+ litres, which would have give better range. any ideas or solutions? thanks peter