Can someone who knows more than me ... (form an orderly queue !!) check these maths .......
Presently I average 25 mpg over all types of driving, When towing the shed its around 18-20mpg... research says (?) a 15% loss of performance using LPG, so I should get around 20mpg on LPG, 15mpg when towing, and using 4.54 ltrs = 1 gall
Type cost/ltr cost/gal p/mile
LPG .43p £1.9522 9.761p @20mpg
Petrol £1.00 £4.54 18.16 @25mpg
saving = 8.399p/mile.... conversion @ £1100 would take 13096 miles to recover costs
LPG .45p £2.043 10.215p @20mpg
Petrol £1.05 £4.767 19.068p @25mpg
saving= 8.853p/mile .... conversion @£1100 would take 12425 miles to recover costs
When towing
LPG .45 £2.043 13.62p @ 15mpg
Petrol £1.05 £4.767 23.835 @ 20mpg
saving = 10.215p/mile so when towing the savings are 15% higher !!!!
As I do around 12000 miles a year it pays for itself in about 12-13 months. I will probably keep the car for at least another 5 years.
Any one see any major flaws ?? Greatly appreciate any comments
Regards
Entwood