With the proper equipment backfires are a thing of the past. Used to happen with the "choke" or the additional priming fuel to start cold. The cold problem is getting proper atomization on a cold engine when the vaporizer has not reached operating temperature and in extreme cold the low pressure from the fuel tank. Requires a bypass on the primary regulator. All doable, just adds to the installation cost. The octane IS lower, it can't be calculated like liquid gasolne, has the effect of leaning out under certain conditions, another reason for the lowered gas mileage (besides the retarded ignition). Another problem is refill times. On a regular car you can refill in minutes. For LPG it takes longer and in many places they want you to remove the tank before they will fill it so it can be weighed as it is filled so it can't get overfilled. In this country propane is very common on fork trucks especially if used indoors. Not exactly LPG but a very similar product. Propane is VERY gentle on motors. I have rebuilt fork truck motors and they come apart with no gunk, sludge, etc inside. A properly installed conversion can be very safe but done wrong they can also be VERY dangerous! Must use a fuel lock-off valve run off oil pressure, relief valve, high pressure braided lines, proper mounts for the tank, and quality components for the fuel system. In this country they must all be UL approved. Another big drawback is the lack of a conventional fuel gauge. You have to keep track of consumption by hours run or miles travelled to know what is left. IMHO it isn't worth it unless you have a daily driver and you can beat the raod tax. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "Tom Niemczewski" <dmctom@...> wrote: > > Hello > > David, the octane rating is HIGHER. For LPG it is something around 105. CNG > is around 120. You are correct about mileage. An engine requires about 20% > more (properly tuned) LPG than gasoline. Low temperatures do not affect LPG. > It's diesel that freezes, not LPG. [moderator snip] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/