This paragraph speaks mostly to the Demand-side:
“Households had the potential to save $630 at the pump, of which they spent the majority58%. This spending provided more than a $200 boost to spending on non-gas goods and services, primarily restaurants and retailers. The lower gas prices also caused significant changes in household transportation choices, leading people to spend $150 more at gas stations and spend less on transit.”---WSJ Real Time EconomicsSubstitutes, Complements, movement along and a shifting of various Demand curve(s).
Happy graph drawing!