Since the word "Okay." will not immediately translate into "you have to go back and look at what you've written and question whether or not you know what you're saying," in your mind (I forgive you; sarcasm doesn't translate well on the internet) I will write everything out which I thought immediately before writing the word "Okay."
I'll toss aside your statement that it "correlates both ways," since it's clear you don't know the definition of the terms positive correlation and negative correlation.
Telling us to "go back and look" is not an argument, when your argument is irrelevant.
The viability of alternative energy sources for automobiles has increased over time, and more specifically over a more recent time frame. Using the historical inflation-adjusted prices is irrelevant in this discussion because the conditions of 1918 or 1958 do not apply to our discussion. The conditions in 1958 are not the same as in 2012: gas driven cars did not have to compete with electric cars/hybrid cars/hydrogen cars. This competition determines the price elasticity of gasoline. Since gas was a necessary good to drive cars in 1958, another near-necessity in 1958, gas prices in 1978 (or even now) are inelastic. Price changes don't affect quantity demanded. In 2012, the conditions are not the same. These new technologies directly affect the necessity-ness (for lack of a better word) of gasoline, and therefore quantity demanded and elasticity of the price of gasoline. You saying "well this is what has happened over 100 years" doesn't mean it will happen forever. The $2.49 comes from an entire century where there was no competition for gas-powered cars, making gas a necessary and price-inelastic good. The next century won't be like that, so let's not pretend it will.
On top of that, your statement implies both a positive correlation and a definite causation between gas prices and the economy. Your math would have to be a bit fuzzy to find a definite positive correlation in the first place (notice the percentage change during the Great Depression is smaller than the percentage change in 2008-12), but let's say that is the case. You'd still be very hard-pressed to say that those particular gas prices caused periods of growth and periods of recession. C'mon man, do you ever hear high gas prices as a reason for the current recession? Or the Great Depression? Or the Dot Com Bubble? Do you realize what you're saying implies?


































































