Bulk propane levels/consumption is a 'black art'. I've had countless 'discussions' with customers over the years with users of LPG powered forklifts and tank volumes/consumption etc.
I've had Calor and Flo-Gas tech guys both explain it to me and it still doesn't make sense!
MJ is on the right track though - it all boils down to temperature on delivery, ambient temp and the likes.
I had a cross reference chart from Calor somewhere giving the volume on LPG as a vapour and as a liquid at different ambient temps.
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Daily drive:
2016 Infiniti QX70.....a car that's even more complicated than my last Infiniti FX to modify 
Current 'Project':
VW Crafter CR50 4 berth camper van
Previous 'Projects':
2006 Subaru Legacy Spec 'B' 3.0R,
1994 Ex-MOD Land Rover Defender, now "civilianised".
2000 Audi S8 FL
www.whall.co.uk
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