Best and easiest way to save gas and engine - well known in Finland

[niiloma]

Hi,

First time poster here..
I bought a used 2000 diesel Ford Focus in Finland. It has an engine warmer called Webasto (look it up in Google). The system is ingenious; it has a timer and you can warm up the car with its own fuel. It uses the car battery a bit - mainly to run the fan but most of the work is done is by the fuel itself. Of course it uses some (very little) fuel to warm up the engine but it saves the engine a lot since it is warm, also the inside of the car is warm when you get in. This is a great invention when you cannot park your car in a garage and when it is cold or wet outside. Anyone else have experience/heard of the gadget? It is very popular in Finland at least..