Silverstone Race To The Sky

Allrightythen peoples
As some of you know I'm off down to Wanaka/Queenstown for the Silverstone Race To The Sky 10 anniversary hill climb.
I'm hoping to avoid all the cops on the way down and back up as well. I'm trying to do it on 1 tank of gas each way (480 odd km) which is kinda pushing the maximum range of the WRXtreme Machine. Just in case I'll be carrying a Jerry can of gas coz running out in the middle of central or in the mckenzie would suck balls.