The base 2013 Beetle uses Volkswagen's familiar 2.5-liter five-cylinder gasoline engine, and scores 22/31 mpg city/highway with the five-speed manual transmission. Base Beetle Convertibles are only available with an automatic, and score a less impressive 21/27 mpg.
Beetle Turbos use a 2.0-liter turbocharged four-cylinder engine and Convertibles score 21/30 mpg in manual and 21/29 mpg in DSG dual-clutch guise. Turbo Coupes rate an EPA-estimated 21/30 mpg in manual and 22/30 mpg in dual-clutch form.
The best mileage is found not with gas, but diesel, in the Beetle TDI. Rating 28/41 mpg in manual trim, or 29/39 mpg with the dual-clutch, for coupe models, and an identical 28/41 mpg for the Convertible TDI (only available with a manual), the estimated figures put it in range of some of the compact/sporty hybrids on the market. In real-world use, many Volkswagen TDI owners have been able to consistently beat the EPA figures.