Hi Stevie,
Same £1595.
If we know £1595 and 7000 miles per year, we just need to know average mpg to calculate payback time.
Suppose you get 20mpg, that's 350 gallons, if petrol is £1.20 per litre that's £1911 per year on petrol.
If LPG is half price (60p) that'd be £955.50 per year but you use a bit more (say 10%) LPG than you would petrol, then again it depends on the price you can buy LPG.. You can buy it at far less than 60p some places, but let's assume 60p and you use 10% more. So now you use £955.5+10% = £1052 of LPG in a year. Actually you'll use a small amount of petrol during the brief engine warmup period too, so call it £1100. So 1595/1100 = 1.45 years = 17.4 months.
Converted about 20 Elgrands so far this year, got another coming for conversion on Monday, another the Monday after, 2 coming the week after that! Got Elgrands booked in through October and November too but not fully booked up, could fit other Elgrand conversions in during that time.
Thanks,
Simon