That depends-for a start, you have been generalising about the EU, without thinking that there are several countries in the EU that do not rely on Russian gas-like the UK for instance (and we are making sure we don't ever depend on Russia) and France who produce more Nuclear power than Russia (EDF being the worlds leading supplier of Nuke Power).
And you have missed the fact that Russia will not cut of the hand that feeds it. And don't presume prices will rise. Russian gas is still available, just not to Europe there is still the same amount of Gas on the market. Europe would find another energy source-and Russia will lose customers. Do not be presumtive that China will want to feed the Russian economy by buying energy.
I don't know much about Oil-but I know Saudi Arabia has the largest reserves anywhere in the world, followed by the likes of Iraq, Iran, Kuwait, Canada. Russia does not control this market so exclusively.
From where Europe is sitting, Russia's ecomony has more to lose in the medium to long term from cutting of gas to Europe.
You do not see things outside of the box. Your message is clear from many threads-you believe Russia is the best at everything. Russia is not an energy superpower-it is just one country among many wanting to sell its spare supplies to make a **** load of money. If forced to Europe will look for other supplies. And Grand Danois has already pointed this out.
And i'm still at a loss as to what the Truck market has to do with the South Ossetian War.