Biofuel is only for diesels. You realy need to consider the miles you drive and the economy of your car first for lpg. Say for example your kit will cost 1000. At 91p a litre thats 1098 litres of petrol you could have used. this is then 241 gallons. If your car gives 48 mpg the thats 11592 mile you could have driven on the cost of the conversion alone. Also consider that the cost of lpg is half that of petrol.
Now if you do drive 20000 miles a year that will cost approx (with above mpg figures etc) £1725 on petrol. with gas at about 45 pence a litre it would cost (using a 40 mpg as gas is a little less economical. (but from personel experience it was actually the same) but ill just play by the rules) £1023. So now 1725(petrol) - 1023(gas) = £702 that means at 20000 miles a year if you get 48 mpg on petrol it will take over 12 months to get the cost of the conversion back alone this is before any savings are made. This makes it ideal for high milers like myself but for low to average milers its only worth the conversion on gas guzzlers.
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