Your first chart shows an 80% increase in VMT over the 20-year period from 1980 to 2000. That's in an era when gasoline was less than $1.00/gallon. And it also perfectly coincides with the accelerated sprawling development that was constructed in the 1980s and 1990s [[which far outpaced the suburban land consumption rate of the 1950s-1970s). That period of rampant sprawl development is never coming back. Ever. No matter how badly you want it to.
So conducting a linear extrapolation from 14-year-old data is not only naive and inappropriate, but stupid as well.
More informative would be a chart that shows VMT from 2000 to 2014.
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