You know, for science. See, the A8 TDI has both a very good highway fuel economy rating and a very large tank, and that means exceptional range. We tested our theory on this by seeing quite how far that range would be for a normal driver.

Now, I'm not a hypermiler, and I'm not someone who pumps their tires up to 60 psi and sits in the right lane at 45 mph. At best, I'm willing to use a light foot and cruise control when necessary. So, how far can we get the A8 to go on one tank of diesel fuel? Much farther than you'd think.

We decided the best way to demonstrate this was to see a dozen of the "world's largest" roadside attractions, all over California. It seemed like a good idea at the time.