20182017201620152014
Same-store sales growth2.3%0.5%0.5%0.4%-0.5%
Same-store sales growth excluding gas2.1%1.3%1.0%0.5%-0.4%

Notes:Same-store sales, referred to by the company as "comparable store sales," includes sales from domestic stores (including relocated, expanded, converted and remodeled) open for more than 12 months and ecommerce sales