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Mercedes unveils powerful new AMG 4.0-litre twin-turbo V8

By John Mahoney Motor Industry 25 July 2014 17:09 Mercedes AMG has released details of an all-new 503bhp 4.0-litre twin-turbo V8 that will help fill the void when the production of its normally aspirated 6.2-litre V8 ends. Lightweight, compact and more efficient than the big 6.2-litre it replaces, the new smaller capacity turbocharged V8 produces 479lb ft from just 1750rpm. The first car to receive the new engine will be the Porsche 911-rivalling Mercedes AMG GT, but other smaller cars like the C63 AMG are also set to benefit from its compact design.

Everything is bigger in Texas, even speed limits

Texas is preparing to open a stretch of toll road this November with the highest speed limit in America: 85 mph. The road between Austin and San Antonio will stretch for 41 miles, in an attempt to alleviate traffic congestion on nearby Interstate 35. There are already roads in Texas and Utah where the posted speed limit is 80 mph.

Ferrari Superamerica 45: One-off 599 created for wealthy American customer

Ferrari has revealed a one-off version of the 599 commissioned by New York-based art collector and property developer Peter Kalikow. Called the Superamerica 45, the new open-top car was created to commemorate the 45th anniversary of Kalikow's first Ferrari purchase, a secondhand 400 Superamerica convertible. It will go on public display for the first time at this weekend's Concorso d'Eleganza Villa D'Este on the shores of Lake Como in Italy.