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Tuner MTM debuts 722 hp Audi RS6 Avant

It seems a minor horsepower war has just erupted over in Germany, and the title at stake in this conflict is which tuning house can build the most powerful Audi RS6 Avant. Not that long ago ABT Sportsline unveiled a 700 hp Audi RS6 Avant, an absolutely rabid grocery-getter that can make the sprint to 60 in just 3.4 seconds. ABT's RS6 Avant packs 25 percent more power than the stock version of the RS6 Avant, which made an already hair-raising 560 hp.

One Lap of the Web: 'Blower' Bentleys, Abarth history and a Checker taxi-camper

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 it comes to high-dollar collector cars, provenance is everything.

The next presidential limousine might look like this

A few days ago, the United States Secret Service posted the bid requirements for a new presidential limousine, which is set to debut during the 2017 inauguration of our nation's 45th chief executive. It's hard to believe that the General Motors-built Cadillac dubbed "The Beast" is already due for replacement, but the fleet of presidential limousines is cycled every four or eight years, with bids accepted from any American automaker. We'll spoil the show for you: the odds of a company other than General Motors winning the bid is pretty slim.