Make	Model	Combined mpg for 2007	Combined mpg for 2014	Difference (2014-2007)	Sign
Chevrolet	Tahoe	17	17	0	None
Chevrolet	Suburban	17	17	0	None
Dodge	Caravan	21	20	-1	Ñ
Ford	Explorer	17	19	2	+
Ford	F150 Pickup	16	18	2	+
Ford	Mustang	17	19	2	+
Ford	Taurus	23	21	-2	Ñ
GMC	Savana Cargo	17	16	-1	Ñ
GMC	K1500 Yukon XL	17	17	0	None
Subaru	Forester	25	27	2	+
Subaru	Impreza	25	27	2	+
Subaru	Legacy	25	27	2	+
Toyota	Corolla	36	35	-1	Ñ
Toyota	Tacoma	21	23	2	+