well the title says it all i expect. I'm looking to buy an X5 4.4 i think (don't see many 4.6's around) for about 7k and then add lpg (about another 2k i guess) or find one already lpg'd for 9k, after low milage sub 60k i think as i do about 20-25k a year. before many of you say i sould look at diesel, i don't pay for any fuel apart from private mileage (about 5k a year) and pay 17ppm on those private miles. so my thinking on the petrol/lpg front would mean that i can get cheeper tax and cheeper running on personal miles but still have all the fun of a big V8, well thats my thinking anyway lol :)? i guess my questions are what do i need to be looking out for when buying and is there anything i need to budget for (apart from servicing) that will cost a lot if it goes wrong. currently run a Mercedes E270 cdi so i'm not put off by specialist servicing costs or slightly higher running costs. BTW sorry if this is posted in the worng section :D Thanks in advance Matt