The LPG kit (Greenfuel) on the 2007 Altis that i use will be turning one year old this coming July. To date i've travelled over 19,000kms and i've only used gasoline very minimally, less than 100kms (for heating up and very short trips of less than 2kms).

I've taken trips to:
- Baguio twice, fully loaded (with a roof box at that)
- San Narciso in Zambales twice
- Subic (fully loaded as well, done then day after my LPG kit was installed at that)
- Tagaytay (i dunno how many times already, and twice straight from Baguio)
- Pampanga twice a month at the least

Changes i did to the engine:
- K&N cone filter and tube intake (done recently)
- Redline Water Wetter mixed with coolant and distilled water
- NGK BKR6EGP (one step colder) platinum spark plugs

Problems encountered:
- Divebomb idle after my first few hundred kilometers (fixed).
- Just recently, the transition between gas to LPG after start-up is accompanied by a jerk (my recent tune minimized it but it still has to be fully solved, will change my plugs in my next oil stop as i havent touched the platinum plugs for over 14,000kms already).

Others Notes:
- All my long trips were done using LPG all the way and not one hiccup has ever happened during those long drives.
- Car could still sustain high speed runs; even hit an indicated 200kph on a highway one time while running on LPG and with a passengers and weekend baggage.
- My average FC in the city has always been consistently between 10km/L to 11.4km/L, same as my gasoline consumption. Highway-city mixed driving is from 11.5 to 12km/L++ (still can't get over the 13km/L mark on the highway as i used to do when i was running on extra unleaded though).
- The lowest FC i encountered was 8.2km/L (first few tanks after my install and my Baguio trip with a Thule roof carrier/box).
- I normally run around over 500kms before i tank up again (have not encountered running my LPG tank dry).
- I still run on my usual Petron Ultron Touring 20W-50 motor oil.
- I used Petron XCS for the regular fuel
- I gas up normally in Petron C5 or Sea Oil EDSA.

Pondering on:
- Switching to NGK BKR7E Iridium plugs
- Long Shot: Getting a programmable ECU chip and doing some dyno tuning if my budget ever permits such (i still feel i can max out more on the fuel efficiency and performance side).

Will be going to Greenfuel soon as Lorna advised to get a overall check-up before the warranty period lapses.