you have to be doing some serious mileage to recoup the expense. It mixes the Deisel and LPG in about a 75%/25% ratio, which doesn't sound much, but it is a two fold gain!
You use less fuel cause the LPG is being used, and you use less fuel because the engine has more power due to the higher calorific value of the LPG which means you don't need such a heavy right foot.
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