For everyones info as Ive not found much on this site regards LPG. Ive just had LPG fitted to my 2008 2.0 Auto with 60K miles and the first fill up indicates a petrol equivalent of 62.2 MPG. LPG is currently 53p a litre and Im getting 8.6p per mile.
£1200 to convert to LPG, for me personally I should cover the cost in the first year. However it always depends on how cheap you can buy your LPG for. Petrol seems to be around £1.19 a litre. LPG is 52.9p a Litre. So £5.35 a gallon compared to £2.65 a gallon. The MPG figure for LPG is less so about 30 MPG on LPG and 32 MPG on petrol. Now my sums may be flawed but I think its about 14000 miles is payback time.
I also have my Honda CRV with 165k miles running on LPG, same engine as my Accord. The CRV does caravan towing duties. Both have valve saver fluid systems. Not had any problems in years of running LPG cars. Fitted KME system to the Accord.
Had lpg on my CL9 but I made mistake of getting the cheapest I could afford, it paid for itself (£750) in three months. Ran it for three years and it had problems that made it uneconomical to repair along with other issues I had with the car so I decided to lay the car up on my drive and buy another 2.4 CL9. Took it straight in for conversion but chose the best I could afford £1200 later the car came back and paid for itself and the conversion within 6 months. I opted for a 65ltr tank I drive around 200 miles for my daily commute. By my reckoning at average 35mpg the car and conversion cost with lpg at 51.9 ppl against an average petrol price of £121.9 I saved a fortune and will continue saving even more when we can go back to work after lockdown