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Wandering the halls of the SAE 2009 World Congress, I came upon the Scuderi Group booth. I immediately stopped because I had lingered in their display back in 2007 to study their split-cycle engine concept. At that point, all the company had were the mathematical formulas on thermodynamics that seemed to prove the potential for their innovative combustion cycle. An animated video showed how the engine might work.

BMW has redesigned its roadster for 2009, and the change amounts to comprehensive maturation, if not quite the obvious transformation from newborn Z3 to adolescent Z4. The new two-seater retains the name Z4, but it adopts two clumsy new model designations, the sDrive30i and sDrive35i. You'll notice there's no M roadster anymore, and word is that none is forthcoming. Nor will we see a return of the historically slow-selling hatchback coupe variant.

As technical editor Don Sherman implied when he reviewed these updated trucks, the Colorado/Canyon twins should have been launched like this--with a small-block V-8 under the hood instead of the weakling four-cylinder or the not-much-better in-line five. The V-8-powered Colorado now has increased towing and hauling capabilities, and it's significantly quicker than its fewer-cylindered stablemates (less than seven seconds to 60 mph, according to both Sherman and General Motors). But what really struck me is the fantastic sound of the 5.3-liter V-8. Floor it between about 2500 and 4500 rpm, and the mill just roars. I actually opened the sliding rear window just so I could hear a less insulated rendition of the motor music. I even think this Colorado deserves more prominent tailpipes (big-tipped, straight dual exhausts, anyone?) to announce its power; I blew away a GMC Canyon at a light, but I don't think the other driver had a clue about what had happened.

There is a reality that is hard to escape; if you want to conserve energy regarding transportation, it helps to reduce the mass one needs to transport.

At SAE 2009, in the basement of Detroit's aging Cobo Center, I met Jon Bereisa, Director of GM's Fuel Cell Propulsion program. I had just completed a drive in one of the hydrogen-powered Chevrolet Equinox SUVs.

One standard of the utopian vision for civilization's future is clean, low-impact, personal transportation. The Segway scooter seemed to embody much of that vision, but with a price starting at $5,000, the geeky looking gyro-balanced scooter hasn't quite taken the nation's sidewalks by storm.