We manage a big 7.8 waverider for a client which has a 225 opti and has 12 seats. with 7 up and doing around 35 knots the consumption is around 35- 40 litres per hour. Open the baby up it will do 50 knots GPS and you start to burn between 85 and a 100 LPH. the difference in revs is plus 700 so that last 10% of the rev range is expensive but big fun.
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo