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Regarding carbon deposit building I wanted to share a story with you. My friend used to drive Opel Astra 1.4L 16V, and he used to be a very genttle on the throttle. After about 6 months of driving he started to have trouble with the dying engine. Mostly when it was idling at the stops it just suddenly died. Since car was still under warranty he went to the dealer shop and they checked whole engine. There was an old mechanic who said to my friend "You're driving too gentle, and probably most of the time it's a city driving". My friend confirmed. After that mechanic took apart the engine and showed to my friend all valves covered with a carbon. Then everything was cleaned and put back together, mechanic just drilled a bit valve guides, to loosen valves a bit. Because that was the reason for engine to die, carbon was blocking valves within guides and valves just ocasionally stayed opened a bit. No compression, no power.
As you can see carbon can cause very strange engine behavior.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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