Our domestic production is six million barrels a day, we have 640 million barrels in strategic reserves and untapped reserves in ANWAR, granted that could be difficult to get in a war with Russia. Our current oil usage is 21 million barrels per day, I would bet barely 5% of that is for military uses. with strict rationing the US could be energy independent and with every day that passes it becomes less likely we will fight a war over oil as we expand our uses of renewable energy sources.
All of Germany's fuel came from Eastern Europe and the Balkans with very, very little in the form of domestic sources. Our domestic supply is stored in/drilled from Texas, Oklahoma, Kansas, Nebraska, the Dakota's (granted that isn't much), Colorado, California, Pennsylvania and West Virginia. We also have the Gulf of Mexico (easily secured by the USN with a large amount of active wells) and Canadian oil sands. We can be energy independent in wartime and with some of the flexfuel vehicles the Army is experimenting with, engines that can run on kerosene and even certain proofs of alcohol, we could even keep our army moving on the stuff we can siphon from Jim Bob's still in the back country of the South.
This idea of food being an issue for the US is ludicrous, not even Canada or Russia can cultivate more farmland in a given year than the United States, keep in mind the US only has 300,000,000 people but we're currently feed far more than that, if we're at war with the world we can stop feeding Africa, Asia and Central America. Just let the market catch up with the prices, the reason prices are so high right now are because the new requirements on ehtanol went into effect last fall well after planting season and just before the harvest, farmers didn't have time to make the proper changes. The people who grow the food won't be the ones to suffer in a shortage, plus soon the oil Sheiks in the Middle East will have to start cooperating once they realize that the US has them by the balls when it comes to food supplies. They're more reliant on us than we are on them, it's pretty hard to grow plants out of sand.