Been doing some interesting (to me at least
) cost calculations.... as I've noticed the prices of petrol and diesel in RWB has been creeping up steadily over the past weeks from 121.9 p/l in February to 136.9 p/l (petrol) and 124.9 p/l to 139.9 (diesel) today, but for once, the price of LPG has remained steady at 58.5 p/l. I've also done a good few miles in that time, both solo and with the tin-tent on the back.
February 7 2018 to May 31 2018. Total mileage in the period : 1997
LPG used 556.57 litres, costing £325.59. The average cost of fuel per mile on LPG = 16.30 p/m
The estimated average cost of fuel per mile on petrol = 28.89 p/m
Average savings per mile = 12.59 p /mile or 43.58% !!
Estimated cash saving £576.93 (est) - £325.59 (actual) = £251.34
LPG used over the period = 556.57 litres = 122.59 gallons. Average consumption therefore = 16.29 mpg (LPG)
Best consumption (solo) 19.98 mpg (LPG). Worst consumption (towing) 13.75 mpg (LPG)
Given the present cost of diesel in RWB is 139.9 p/ltr, and petrol is 136.9 p/ltr, that works out at £6.35 a gallon for diesel and £6.22 a gallon for petrol.
At 16.30 pence /mile (average) on LPG that is the equivalent of 38.9 mpg on diesel and 38.2 mpg on petrol .. not bad for a 3.2 litre !!!
The average "solo" consumption is 19.02 mpg (LPG), which equates to 13.96 pence / mile, the equivalent figures become 45.5 mpg on diesel and 44.6 on petrol
Over the 10 years and 98,544 miles since the conversion was done the "savings" figures are a little less, as they include the cost of conversion, replacement parts, servicing etc and include periods when LPG was "higher" in relation to "lower" petrol prices, but the estimated overall savings over the whole period is presently £7469.70 or 38.06%
There is a very small "gotcha" to the figures as the car starts on petrol and runs on it for a short time before switching, so an "extra" cost would be the petrol used price, however, I only put petrol in about twice a year, and have never kept a record of that, although I sometimes wish I had, any attempt to inject a figure now would be total guesswork and probably totally erroneous.
Am I happy with LPG ..
YOU BET I AM