You actualy save MORE in cash terms when towing than you do on petrol !!!
EG ...
solo
I get 23 mpg on petrol ... at £1.35.9 / litre (£6.17 gall) thats 26.8 pence /mile
I get 18 mpg on LPG at 73.9 p/ltr (£3.35 gall) thats 18.6 pence /mile .. so solo I save 8.2 pence every mile.
Towing
I get 17 mpg on petrol which is 36.3 pence/mile
I get 14 mpg on LPG which is 23.9 pence /mile
so the saving when towing is 12.4 pence / mile
Far more cost effective to tow on lpg than petrol ..

simple because you use more fuel when towing ... so you are using more of a cheaper fuel rather than more of an expensive one ..

LPG everytime here ..

BTW .. the drop in consumption from petrol to LPG is about 20% .. and remains constant whether towing or not. It is NOTHING to do with LPG being a "bad" fuel or any such rubbish .. it is simple physics.
ALL engines actually burn a MASS of fuel .. not a volume, and LPG is 20% lighter than petrol ... if you were to supply a kilogramme of petrol and compare it to kilogramme of LPG .. the range would be virtually the same.
HTH
