By Spencer Jakab 

Look no further than the auto market for evidence that people don't think ahead.

That doesn't mean we fail to consider current circumstances; rather, we unrealistically extrapolate from them into the future. The most amusing example was documented by researchers at The University of Chicago's Booth School of Business. They determined warm temperatures or sunny skies on a given day materially boosted sales of convertibles.

The decision of which car to purchase, or to buy one at all, is influenced more by economics than emotions, though. So headlines play an outsize role. Tuesday's reports by car manufacturers on U.S. auto sales during November should illustrate that connection.

The big story these days is that oil prices have collapsed to a five-year low. Add to that the best employment situation of the economic recovery and borrowing rates that remain near record lows and it should be little surprise November's outlook is stellar. Analysts at Cars.com think light-vehicle sales hit 1.285 million for a seasonally adjusted annualized rate of 17 million. November unit sales haven't been that high since 2001.

But what comprises those units? Much like that headline number, the sales mix and actual dollar value is likely to be favorable. That is particularly so for U.S.-based companies Ford Motor Co., General Motors Co. and Chrysler Group LLC (part of Fiat Chrysler Automobiles), which make the top three selling vehicles, all pickups. For example, the ratio of sales of typically more-expensive trucks to cars was 109% over the past three months. That is more than 10 percentage points higher than the average since 2008.

Toyota Motor Corp.'s October sales show this in microcosm. Sales of its Yaris, Scion and hybrid Prius were down by 10%, 15% and 14%, respectively, year over year. Sales of the pricier but less-efficient Highlander rose by 30%.

With the average new car remaining with its first owner for nearly six years, though, basing a decision on today's pump prices may be hasty. Someone buying a subcompact in the summer of 2008 because crude topped $145 a barrel saw oil plunge below $40 later that year, surge to $115 by 2011 and then collapse to $66 this week.

Rational or not, the energy market's tailwinds are like a cool breeze in Detroit's hair these days.

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