I sold my 2001 GMC Sierra 2500HD back in 2014 for a used sedan--it still gets about 23mpg vs the 11mpg the Sierra got. Gas was less than $1 a gallon when I bought it new in 2001, but by 2014, I no longer needed a pick-up truck and gas was getting expensive. I remember seeing $2.01 at gas stations in 2005, and though it was the end of the world! While considering jobs in 2014, I had to keep the commute under 15 miles one way in order to keep it cost effective for the low pay I was getting. You may wish to look at a used Mazda3--my wife has had three in the past 13 years, and her 2020 gets 33mpg (a gasoline engine). Compare that to just keeping what you have as others have suggested. On the commute: no way would I do a 67 mile commute twice a day. 30 miles is my limit.