I did think about getting a gas kit fitted, that was untill I worked out how much I would save against the cost of fitting a good kit.
I would need to keep the car for 2+ years to make the money back, being honest, I dont think that I'd keep the car that long.
I'm not saying anything against it, I just dont keep cars for long is all.
Mind you, the way the price of fuel is going I may well just keep my 1.0 Polo that I have for sale