I put the Prins VSI2 system on my KK earlier this year. I get around 400km from a tank of petrol and 300km from a 60L tank of LPG. A lot of city driving and everything you could think of going against it from mud tyres to roof rack.
It runs super smooth and I can't fault it. I would say it's worth it if you are holding it long term or planning on a lot of kilometres. The extra range is certainly handy.
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'10 KK Cheroke
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