You'll be royally eff'd if there's a successful Ghadafiesque push to trade oil in Euros. Why the USD remains a haven currency is beyond me - there's only two exports to be had these days, weapons and Hollywood. You don't have enough oil to meet your own demands, you're facing a serious water issue in the coming future and successive governments have allowed corporations to not only become "too big to fail", but to export any real industry at the same time. You make movies and money. One of them is a completely fantastical creation of no value and the other is mind-numbing entertainment.
The threat to the US economy is not oil imports, it's job exports. If you don't export anything, no amount of fuel conservation is going to fix the trade imbalance.
You've obviously not looked at US trade data.
The US dollar is the global reserve currency b/c manipulating its value allows foreign nations to siphon money out of our economy. Since 2000, the US has run a cumulative trade deficit of over $8T. Our currency should be worthless, but many countries have a vested interest in propping up the dollar so they can sell us oil, cars, computer/telecom equipment, consumer electronics, and cheap Walmart goods. As long as our currency is artificially strong, foreign goods can get in and our jobs can leave. Artificial currency valuation also makes it difficult for the US to export.
Long story short, those days will soon be gone. Germany and Japan have been told to build auto plants in NAFTA countries. Honda, Mazda, Audi, VW, and BMW are all building in Mexico. Nissan is reallocating production to Canton, OH and Smyrna, TN. Subaru are building in Indiana. Toyota are finally completing the Prius plant in Mississippi. The US is drilling and fracking, which means we will buy significantly less energy from Canada, Mexico, Venezuela, and Saudi Arabia. Natural gas production will make industrial electricity considerably cheaper, and if Obamacare doesn't suck (50/50 chance), labor overhead should decline. Manufacturing will come back to the US.
China should take care of itself. Wages and industrial real estate are becoming cost prohibitive, and the renminbi is slowly appreciating to its appropriate value. China will buy our passenger cars and planes to keep their currency in check or US companies will start allocating production to South/Central America.