13 Durability —Directors are advised that in the test programs, more than 30 vehicles have been converted to Liquid Injection over six years with some 3,000,000 Km covered in road testing. The results have been excellent, with nothing more than to be expected electronic integration problems. As above, 200,000+ Km in two vehicles. Vapour systems tend to gum up the vaporiser from the heavier, gooey elements of the LPG left behind. Replacement of the vaporiser is the usual result and is expensive. Liquid Injection does not allow this, as the liquid is squirted through the injectors and they stay clean. Fine metal particles, which reduce efficiency in gas injectors, simply wash through Liquid Injection injectors.