One Lap of the Web: Porsche 959s, the Alfa Romeo 4C and the Mercedes-Benz A45 AMG vs. the BMW M135i

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- When initially produced to satisfy FIA homologation requirements in 1986, the Porsche 959 was the world's fastest street-legal production car.

For 1.4 gallons, Nissan sends Juke owners $400 and an apology

Nissan Motor Co. has notified some Juke owners that if they are unhappy about a goof in the car's marketing material, Nissan will buy it back from them. Materials for some all-wheel-drive Juke models mistakenly said the crossover's fuel tank contains 13.2 gallons, the same as the front-wheel-drive version.

GM envisions future city car with EN-V concepts

The city car of the future will seat two people, run on electric power and communicate with other vehicles to reach a destination faster while automatically avoiding traffic tie-ups and crashes. General Motors, working with electric-scooter maker Segway, has developed three concepts tailored toward that vision of future transportation. The Electric Networked Vehicle, or EN-V, concepts go on display May 1 at the World Expo in Shanghai.