2002 Audi A4 Quattro 3.0l on 2040-cars

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40+ cars that barely avoid the gas guzzler tax

The Gas Guzzler schedule, with mpg ratings and charges that haven't changed since 1991, lays out which fuel-swillers owe what to Uncle Sam.
I started thinking about the "Gas Guzzler Tax" - considerably less well known as The Energy Tax Act of 1978 - when I was driving Dodge's new Challenger SRT Hellcat last week. Unsurprisingly for a car that can burn 1.5 gallons of gas per minute at max tilt, theoretically able to empty a full tank of premium in about 13 minutes, the Hellcat will be subject to the Gas Guzzler Tax schedule when it goes on sale.

Audi is working on a suspension that gets power from bumpy roads

Regenerative brakes aren't new. They're on virtually every hybrid and EV, and they're even starting to pop up on traditional gas-powered cars, like with the i-ELOOP-equipped Mazda6. But even with these systems, cars can get more efficient, and Audi thinks it found yet another source of wasted energy. The source? The suspension. The idea is to turn the kinetic energy that goes into the dampers into usable energy instead of as waste heat. Audi isn't the first auto company to come up with regenerative suspension – nearly three years ago, ZF introduced its GenShock technology, which used a valve attached to traditional, oil-filled hydraulic shocks to recapture kinetic energy from movement caused by bumps in the road. Audi's prototype technology, which it calls eROT, replaces traditional dampers with horizontally oriented electromechanical rotary dampers. eROT is apparently short for electromechanical rotary damper. Neat. In testing, eROT recovered an average of 100 to 150 watts on a typical German road, three watts from a fresh piece of pavement, and 613 watts on a rough stretch of tarmac (wattage is calculated as power over time, so this is actually the rate at which the system harvests energy). The dampers channel that energy to a tiny, 0.5-kWh, 48-volt battery. The prototype is claimed to cut CO2 emissions by three grams per kilometer (4.8 grams per mile), while the company believes a future production version could save up to 0.7 liters of fuel per 100 kilometers of driving. Converting the savings to American miles per gallon isn't easy, so we'll use a practical example. In the US, the Q7's supercharged 3.0-liter V6 returns a combined rating of 21 miles per gallon, which works out to 11.2 liters per 100 kilometers. Apply eROT's 0.7L/100km savings, and the Q7's economy would improve to 10.5L/100km, or 22.4 mpg, a 1.4-mpg improvement. That's not huge, but because math, 0.7L/100km is more dramatic on a more fuel efficient vehicle – taking an A3's 27-mpg combined rating and adding eROT would drive efficiency up 2.4 mpg, for example. There are a few other big benefits beyond fuel and emissions savings – Audi claims eROT provides a more comfortable ride than traditional active suspensions, because engineers can tune the compression and rebound strokes independently of each other. Beyond that, the horizontally oriented rear suspension geometry means more cargo space, since the dampers don't poke up into the cabin like they normally do.

The Audi R8 e-tron is dead with less than 100 built

According to a report from Car and Driver, the Audi R8 e-tron is dead (again!) after fewer than 100 examples of the all-electric model were built. This is an anticlimactic end to what could be termed an e-saga, with enough twists and turns to make a Hollywood scriptwriter sit up and start pecking out a screenplay. But here's the important number to keep in mind: 100. That's the production number the R8 e-tron failed to reach. The final tally is less than that, an Audi rep told Car and Driver. And what few were built were sold furtively, and only in Europe, in a strange back-channel in which dealers referred potential buyers right to Audi HQ, says the report. All of these transactions happened without the benefit of an online configurator or any published materials, we understand. That doesn't sound like a recipe for wild success – and neither did the $1,000,000+ pricetag. And this is just the latest stumbling block for the R8 e-tron, which was cancelled the first time back in 2012 when it was still based on the sinister, classic shape of the first-generation R8. If you recall, there was some confusion about the limited run of those first-generation cars, which were initially tipped to be sold to the public. In a strange move, Audi walked that back and held onto the cars for "internal purposes." So it was, until 2015, when we saw the second-generation R8 e-tron in Geneva. Audi promised it'd go on sale in 2015 "upon customer request," which was some foreshadowing to the unusual dealership referral sales model we discussed above. Nonetheless, it seemed like it would be a supremely interesting electric sportscar, with 456 horsepower, 679 pound-feet of torque, a 0-62 mph time of 3.9 seconds, and a range of up to 280 miles. Alas, except for the fewer than 100 European owners who managed to take delivery before Audi yanked the cord, the R8 e-tron's emissionless charms will go unappreciated. We're hoping to get more specific confirmation from Audi about the nature of the cancellation and the exact number produced; until then, stay tuned. Related Video: