These will show at a glance the city and highway fuel consumption ratings and an estimated annual fuel cost for that particular vehicle. (ecolife.com)
Getting 28 mpg combined, Fueleconomy.gov says it's possible to make up the $ 3,700 premium you'll pay for the diesel (versus the base engine) within seven years; as of November 2013, the site put annual fuel costs at $ 2,050 for the TDI and $ 2,600 for the supercharged V - 6. (cars.com)
It's also considerably cheaper to run the Model S over the S7, with the EPA estimating annual fuel costs of $ 650 for the Tesla, and $ 1,750 for the Audi. (cnet.com)