It is extremely difficult to even guess at what the "inflation-adjusted" price of oil is compared to the highs made in the late 70s/early 80s (a period of vast inflation too, on its own), compared to the highs in oil price we have now, primarily because the government's own official inflation index -- which is used to make these calculations is
demonstrably and provably a wicked lie.
So I think given that inflation has been deliberately and grossly lied about by the government, oil prices today are probably not all that high as they sound like, or as high as they will eventually get. That is to say, without lies about the rate of inflation and hidden money creation, oil is still not even close to being priced at its real market value given the reality of Peak Oil.
If we say that oil properly priced in a depletion scenario should be $100 or $200 a barrel, or US gas should be $4 or $5 if we do not take into account the whip hand of hidden inflation, we are grossly underestimating the true value of oil in an era when spineless politicians and their lackeys simply turn on the money spigot in a desparate attempt to prop up the housing bubble and print checks for these unsustainable ridiculous projects of intergenerational thievery called Social Security, Medicare, Medicaid, and all that.
In a true hyperinflationary scenario, oil could hit $10,000 dollars a barrel, easily. But in such a miserable age of course those dollars would be worthless; a candy bar in a vending machine would cost $100. And of course the government -- and this is the only way they can ever fulfill these ridiculous promises to the Baby Bummers -- will be handing out Social Security checks of a couple thousand dollars a month. Enough for seniors to buy a sandwich.