m not sure if he's the same guy as u r talking about as he didnt had a cng nozzle but was planing to get one unless same guy got it now
so yellow n not orange 
for winters i guess just start using domestic cylinder with pre filled lpg at a fixed cheaper rate 
yea rates go up in winters but i was thinking atleast lets pass the really hot burning hot summers n then worry about winters when it comes to that, cng is available for 2 days in summers, so that makes it a 1day or half day for winters? lol
travel route is all inside rwp not expressway, the broken down kashmir highway till g13 toll plaza n then peshawar road all the way till lalkurti n same route for coming back, u can hardly reach at any speed on that road esp while coming back, u can drive faster in isl as compared to peshawar road
also u got manual so its supposed to give better avg but do u run it full time on ac except for evening time?
btw if u do get lpg filled then u cant switch back to cng unless u get the lpg out by inverting the cylinder, dont know if u need to get it cleaned as well but well it'll be serviced then 
also so far no one really mentioned coming back to cng from lpg so lets hope for the best, u dont really face lines but em tired of them esp this parking of one day earlier n then if i have to go some where then place bricks n ask some1 to stand guard the place