Pretty sure the Lexus puts out peak HP at about 5200rpm in standard form, so the pitch & nozzle OD must be about the right match.
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As I said indicative, worst I could get racing a bouy course was around 90 min.
More usually chuck the missus on the back and a picnic and cruise at 40-50mph all round abletasman and only use half a tank.....but factory spec at constant full throttle was 60l an hour.