OMVL LPG Injectors

Anyone suffering from deteriorating fuel consumption on OMVL injection systems? I was, and when I looked into it and found this link:

I changed the O-Rings in my injectors and it made a huge difference (was

9mpg, now 16mpg). If anyone wants any O-rings to do the job, I've got loads left over so I put them on E-Bay:

Of course I can't recommend that you play around with an LPG system, because I'm not a registered LPG installer, even though it's a doddle to do the job!