In my capacity as an automotive journalist, I have driven the Mini Cooper before. Several times, as a matter of fact. But when the red 2008 Mini with black stripes was delivered on Friday, I had a mission in mind. I was going to put its EPA fuel economy estimates to the test.

The Mini Cooper in my possession for a few days had a standard 1.6-liter, 16-valve, 4-cylinder engine that could turn out 118 hp. It may not sound like much, but in a car this small, it’s enough. It also had a six-speed manual transmission, which would help in the mpg department. The test car did have sport suspension and 16-inch wheels, rather than the regular 15-inchers, but I didn’t think that would affect the fuel economy much. The EPA estimated 28 mpg in the city and 37 mpg on the highway.

The morning the Mini Cooper appeared in my driveway, I was already late for lunch. I grabbed the keys, reset the mpg counter, threw the car in reverse, and tore off in the direction of the restaurant where I would meet a few friends. I did not drive responsibly. Safety was, as always, my priority, but speed came in a close second. I was surprised, on reaching the restaurant a few miles away, that I had still averaged over 32 mpg, even driving like a jerk.

Over the next few days, I drove in a much more sane way around Portland. Lots of in-town driving, some freeway, some stop-and-go traffic at 5:30. It never dipped below 30 mpg. As you can see, after five days of normal driving, I averaged 33.7 mpg. This is above the EPA’s combined rating for the Mini Cooper of 32 mpg.

I have to give the car back, and it’ll be a while before I get another. BMW, which owns the Mini brand, is pulling back on its press loaners for now. In the meantime, we can all look forward to those precious few electric Mini E models coming to the States for real-world testing.

This car was provided for review by the manufacturer at no cost to the reviewer.

I decided to give the calculator a test run, as I just took a drive to Auburn, Washington, for work, and I know what I spent on gas for that little adventure. The first thing I found was that if your car is older than 1999, you won’t find it in the drop-down menu.

Cost to Drive couldn’t find my little red truck in the system, so I entered it free-form style, including the MPG and size of the tank.  It told me I could expect to spend $25.75 on that trip, which was just about right. But I could have figured that out in my head using the information it had me type in.

The builders of the site call the process “galculating,” which is what I did while stuck in traffic on Interstate 5 yesterday. “If I sit here for x number of minutes burning y gallons of gas, how much time and money am I losing?” There’s nothing like a traffic jam to make word problems seem fun.

Cost to Drive may help you decide if a trip is worth it, or it may help you compare the cost of gas to the cost of a train ticket, but the math is pretty easy. I firmly believe you could figure this stuff out without a dedicated web site, but if your brain is having a difficult day, then Cost to Drive may help.

The summer saga began when I took the Kymco out for the first time, in May. I drove it a few miles and parked it while I volunteered at my local humane society. While I was volunteering, the entire contents of the gas tank leaked out onto the pavement. The maintenance guy stood watch to make sure it didn’t burst into flames, then used his forklift to put it in the back of a pickup truck to drive me home.

(Eco-recap: gas on the ground and running into a nearby rainwater grate is absolutely not good for the earth. Neither is strapping a scooter to the bed of a half-ton pickup truck.)

The guy at the shop where I bought my scooter in 2002, which by now has 4,500 miles on the odometer, said that Kymcos of a certain age can have leaky fuel filters. I asked if I could repair it myself, and he said, “You can do anything yourself, just be sure not to strip the rubber gasket when you tighten the filter.”

Cool, I thought, I can do this myself. Except that I’d never repaired anything mechanical before, and I was intimidated by the very idea.

Until last Sunday. I downloaded the repair manual for ten bucks, got out the socket wrenches, and took pictures as I went — kind of like digital breadcrumbs, in case I got lost. I found out that the hose was cracked, not the fuel filter, and bought a replacement part at the scooter shop for another ten bucks. All in all, from start to finish, it took a grand total of about two hours, three tools (socket wrench, allen wrench, and pliers), and $20.

So, if gas prices have you considering a scooter, go for it! They get great mileage (mine gets about 80 mpg) and are simple to repair — by you or your local shop.

The review is produced annually by Dow Jones Indexes and SAM, a sustainability investment specialist. They analyze corporate economic (i.e., risk management), environmental (climate change mitigation), and social performance (labor practices) in 57 industries. BMW scored well enough in all three categories to be the leader in the Automobiles sector.

SAM and the DSJI aren’t in it for the love — they’re in it for the money. And the money says that investors are demanding sustainable practices from industries.

But this is not an endorsement of BMW vehicles as particularly green. The popular 3-series gets about 21 mpg combined and emits a middle-of-the-road 8-9 tons of CO2 annually, while the company’s MINI lineup is rated at 29 mpg and 6.3 tons of CO2 annually. At the other end of the spectrum, the top-of-the-line M6 gets 13 mpg and releases 14.1 tons of CO2 annually (it also starts at $101,000).

BMW has complained loudly about how difficult it will be for it to meet the new CAFE standards in the U.S., and has paid millions in fines for CAFE violations in the past few years. So while their manufacturing processes may be sustainable enough for the Dow Jones, they’re a little lacking where the rubber meets the road.

California Governor Arnold Schwarzenegger has teamed up with Governor Bill Ritter of Colorado to unveil the ecoDriving campaign. [WARNING: When you click on that link, the Governator immediately starts talking to you, with nary a stop or mute button in sight.] Auto manufacturers and dealers, along with industry leaders and politicians, have aimed the campaign at drivers who want to increase the fuel efficiency and reduce the emissions of the car they already drive.

The site offers tips like keeping tires properly inflated and “riding the green wave” — maintaining a steady speed to hit all the green lights on a long street. I have an uncle who is the king of this maneuver; I thought he was anal, but it turns out he’s a natural-born ecoDriver. The site also recommends keeping the gas cap tight to reduce evaporation.

There’s a clever ecoCalculator to tell you, based on your yearly mileage, mpg, and driving habits, how many pounds of CO2 you could be saving by adopting a couple new habits. If I kept the tires on my little red truck inflated, for instance, I’d save $68 a year on gas and keep 76 more pounds of carbon dioxide out of the atmosphere.

The site has games, resources, and will help you send a message to your governor asking him or her to sign on to the ecoDriving campaign. In a related measure, the National Automobile Dealers Association is recommending that its members give free green checkups in the month of September, along with child safety seat inspections.

The Cobalt XFE has done so well for GM in these days of expensive gas and carbon-consciousness that it’s expanding the fuel-efficient XFE measures to the much larger Silverado, Tahoe, Sierra, and Yukon this fall.

The XFE models get 5% better mileage on the highway and 7% better in the city, which in trucks and SUVs as big as these is still a pretty small difference. All four models will get 15 city, 21 highway, as opposed to the vanilla varieties, which get 14 city, 20 highway. Huzzah!

The difference the XFE tweaks make is more noticeable in a small car like the Cobalt, where the company first used them. The regular-issue 2008 Cobalt with an automatic transmission gets 22 mpg city and 31 mpg highway; the 2008 FXE trimmed Cobalt gets 25 in the city and 36 on the highway.

The XFE designation means the vehicles were lightly redesigned with more fuel-efficient engines and better aerodynamics. The four new trucks all have:

• 5.3L Flex-Fuel engine
• Aluminum cylinder block and heads to reduce mass
• Lowered suspension to improve aerodynamics
• Aluminum wheels and spare to reduce mass
• Low rolling resistance tires with higher tire pressure

GM, with BMW close on its heels, has developed a thermoelectric generator that could create enough electricity to augment or replace the usual alternator in a gasoline-powered car. Thermoelectric devices can use temperature differences to create electricity. When one side of the generator is heated, electrons move to the cooler side. The movement creates a current, which is collected by electrodes and converted to electricity.

The GM prototype is set to be tested in a Chevy Suburban next year, where a 10% fuel economy boost would mean a 1-mpg improvement. In a small car like the Chevy Aveo (the Suburban’s exact opposite), the boost could be enough to put its combined economy over 30 mpg. BMW and its research partner Ohio State University will run tests of its prototype next year, too.

There are currently, as of the minute I’m writing this post, 1,981 cars registered with the site. Interesting note: there are more Jettas using Fuelly (71) than Priuses (34), and more Civics (157) than any other model. There’s one Ferrari Testarossa listed, but right now it says it gets 200,000 mpg after one fill-up. I find that hard to believe.

The site also offers gas-saving tips, most of which I’ve covered over at sister site RiverWired.com, but they always bear repeating. And there’s a forum for asking questions and posting your own fuel-saving tips.

A recent story in the Argus Leader said Harley riders were open to the idea of an electric bike. The browsers quoted in the story didn’t say they were ready to give up their hardtails and ape-hangers for a 60-mph electric scooter, but they did like that the Vectrix was a zero-emissions vehicle.

Keep in mind, though, that Harleys are no slouch in the mileage department themselves. The 2009 Sportster 883 Low, to pick a model at random, gets 54 mpg in the city and 60 when you get your motor runnin’ and head out on the highway. But what comes out the other end, while hard to pin down with exact numbers, is apparently bad enough to warrant a California emissions fee of a couple hundred bucks.

For you do-it-yourselfers and engineers out there, the kit includes lead-acid batteries and the box to hold them, charger, and wire harness. There’s also a switch you can flip to operate your Prius on battery power up to 52 mph — 10 mph higher than an unmodfied Prius. The converted PHEV can then run 10-15 miles on electricity before the gasoline engine kicks in, giving you 100+ mpg. Plug-In Supply even designed the kit to be upgraded to lithium-iron-phosphate batteries for longer range, when they become available.

There are currently only a handful of dealers where you can buy the kit and lug it home, but Plug-In Supply is looking for more. Those nine dealers already on board stretch from California to Florida and New Jersey, though, so you might be able to find one not too far from home.