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I travel 25k a year and was wondering which is the best type of fuel for economy, Duel fuel or diesel?
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Don't really know but I imagine the conversion is quite expensive if you are not getting a car already done. I believe that the cost is about £1.5k
I also think that it comes down to how confident you are that you will be able to fill up the car as and when you want. I am in London and there are a fair few stations with LPG and this is ever increasing. But out in the sticks there does not seem to be many LPG pumps (or maybe I am not looking for them!).
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If you are in London and want to avoid the congestion charge, LPG.
Otherwise it depends on the car but most of the time, diesel. If you are buying used, you will have much more choice if you go for diesel.
You also know that you are safe from taxation increases (unless diesel becomes much more expensive relative to petrol) as the source of the savings is the efficiency of the engine.
You will also have no insurance problems with diesel (you shouldn't with LPG but not all insurance companies like it.) You know you can always get diesel, and therefore cheap motoring, whereas with LPG you may be forced to revert to petrol.
It might be an urban myth, but LPG engines have been said to wear out earlier (around 80k) than diesels (200k+). Diesels will also generally have more torque and flexibility, particularly as certain engines (like the VW 1.8t) with turbos don't like the conversion to LPG.
There are no warranty hassles with diesels either, as there might be if the coversion isn't done by the manufacturer.
To give you an idea
Golf 2.0 GTi, fuel costs of LPG over 25k at 32 mpg and 39.9p/litre = £1416
Golf 1.9pd GTi - diesel, 53mpg, 76.9p/litre = £1648
Of course, if one tank in 10 is petrol rather than diesel, most of that saving evaporates. Personally I would swallow the extra £4 a week on fuel and avoid the hassle.
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