You can't in good conscience as I cannot imagine any energy analyst with any kind of a track history actually thinks that the decade rise we've had will happen again, bringing gas prices to $7+ gallon a decade from now. That won't happen.
Instead of picking an ultra low spot from a decade back it would be better to extrapolate over the past few decades.
You'll note that in fact gas has yet to hit the peak it hit in 2008, so if we pick a period 4.5 years ago and extrapolate from that we end up with lower gas prices 4.5 years from now
The extremes have to be smoothed out for any statistical analysis to be meaningful.