The top 10 selling cars in July 2013 all get a combined MPG between 28 and 32 in their four-cylinder offerings with automatic transmission. In June most consumer spending was on autos and gasoline, and when those were backed-out, remaining retail was actually down 0.1%, the first time in a year. Soaring gasoline prices have no doubt been at work in spending allocated to more fuel efficient vehicles. Gasoline has been averaging above $3.50/gallon nationally since the beginning of February. See Good Car Bad Car here for car sales data by month.
Toyota Camry 28 mpg
Honda Civic 32
Honda Accord 30
Nissan Altima 31
Chevy Cruze 30
Toyota Corolla 29
Hyundai Elantra 32
Ford Fusion (fwd) 28
Hyundai Sonata 28
Ford Focus 31