Are Gas Prices and HEV Sales Actually Related?

This is a paper I wrote for my Energy Economics class this past semester, where I (attempted) to look into whether or not there exists a link between Hybrid Vehicle sales and gas prices; at least, from 2011-2018. Long story short: it depends, the typical economist answer. With OLS, there exists a link (though, perhaps not anymore). With a VAR or VEC model, not so much. My conclusion? Changing gas prices isn’t going to get everyone on board with HEVs, and linking their decline in sales in 2014 due to falling gas prices may not be the best logic.