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Top horsepower-per-dollar cars in 2017

Bang for the buck. That quasi-scientific statistic is bandied about by motor heads everywhere from classrooms to barrooms, though the truth of the matter is that it's exceedingly complex to measure. A fair performance-per-dollar index would include something like cross-referencing MSRP (Manufacturers Suggested Retail Price) with point-to-point times on a track or driving route, which is obviously hard to do comprehensively. But, for the sheer joy of talking about cars and playing with a big spreadsheet, there's always the horsepower-per-dollar index, which is more straightforward, albeit hilariously flawed. There are vagaries even with this simple formula, of course: MSRP for vehicles can change at a moment's notice, to say nothing of the bottom-line shifting that happens with local deals or showroom negotiation. For this list we're running with the straight MSRP wherever possible, and as recently reported as we can get it. All the vehicles on this list are 2017 models, and all trims are reported where the lowest price and differing power levels intersect. Some choices were made for personal preference and some for sanity, avoiding things like all 48 trim levels of the Ford Transit, all with the same horsepower). If this list were a simple top ten, or even a top fifty, you'd be bored to tears with all the red, white and blue that is represented. Following perfectly with conventional wisdom, American cars really do lead the world where hp/$ is concerned. So, for the sake of variety (and the sheer joy of seeing a minivan 'win' one round of this thing) I've sorted out some top five and bottom five lists for broad power categories. Let's dive in. Less Than 100 Horsepower Okay, okay, this is hardly a category we'll grant you. But we've often tried to click off all the sub-100-hp cars on sale in the US, and making this list gave us an excuse. It also illustrates that none of these smallish vehicles bring cheap horsepower to the table - for that you'll need a motorcycle. The segment-leading Chevy Spark (above) asks just over $139 for each hp, and that Smart Fortwo Electric Drive has hp on sale for about the same price as its very distant family cousin, the Mercedes-Benz SL65 AMG (insert your favorite Smart joke here... we know you want to).

2015 Dodge Challenger SRT 392

I've just started reading the third installment in a planned five-book biography of Lyndon Baines Johnson, Master of the Senate, written by the incomparable Robert Caro. Conveniently, a recent trip to drive the BMW X6 M and 228i Convertible was to be staged in Austin, TX, within easy driving distance of LBJ's birthplace, Johnson City. And yes, the city is named for his family. Having completed my duties with the Bimmers, I borrowed the spangled 2015 Dodge Challenger SRT 392 you see above, to squire me around the Texas capitol for a weekend, and as a lift out to the Hill Country homestead of our 36th President. Johnson City isn't exactly a road trip mecca, but there's a pretty good brewery, a museum, the reconstructed LBJ house to take snapshots of, and it's a nice drive to get out there if you've got a 485-horsepower muscle car at your disposal. Driving Notes With the heroic Hellcat, this 392 and the R/T Scat Pack (that Brandon Turkus reviewed recently), there are more SRT-treated Challengers to choose from than ever before. There are 707 obvious reasons that the Hellkitty is the top dog (as it were), but there are important difference between this 392 and the Scat Pack, too. Both cars make use of the 6.4-liter Hemi V8 putting out 485 horsepower and 475 pound-feet of torque, but the 392 also gets an adaptive suspension, six-piston Brembo brake calipers (instead of four-piston), wider tires, leather and Alcantara seats, a heated steering wheel, a louder stereo and HID headlights. When LBJ was campaigning for his seat in the House of Representatives, he would've loved to have something as potent as this monster of a V8 under the hood of his canvassing car. The 6.4L snorts with authority before it sends the big coupe forward to just about any speed I'd ask of it, and with a quickness. Johnson was known for haranguing drivers to step on it, when all that stood between himself and a few more votes was the ability to fit one more stump speech into the day. The 392 feels as though it could cover a quarter of the state of Texas in a morning if you throttle down deep enough (faster even than the Johnson City Windmill, I'd guess). Though there's a six-speed manual available, I'm actually quite fond of the eight-speed automatic in the 392. The two-pedal setup better suits the fast-cruiser attitude of the car, and it never served up any poorly conceived shift logic when I left it in D. Of course, the roads are better now than they were in the 1930s and 40s, too.

2016 Dodge Viper ACR racks up lap records

With 645 horsepower and an adjustable spoiler nearly six feet wide, the 2016 Dodge Viper ACR would look at home on the runways of most any airport, air base, or aircraft carrier in the world. But it's not built for the runway. It's built for the race track. And it has positively mastered them one after another. In fact, the new Viper ACR has not only beat the lap times of its own predecessor as it set out to, but took the production-car lap record at 13 tracks across the country. The endeavor started out at the Inde Motorsport Ranch in Arizona, where development engineer Chris "The Wolf" Winkler set a lap time of 1:33.75 on the Configuration 4 track to beat every other street-legal vehicle to ever lap the circuit. Then it was off to Buttonwillow, the MotorSport Ranch (in Cresson, TX), Big Willow, VIR, Grattan, Pittsburg, GingerMan, the Motown Mile, Nelson Ledges, Waterford Hills, and Road Atlanta. And with the new American Club Racer, Dodge took the lap record at each and every one. The journey culminated just days ago at Laguna Seca, where track expert Randy Pobst climbed into the Viper ACR and set a lap time of 1:28.65. That's 5.27 seconds faster than the previous ACR's time, and 1.24 seconds faster than the Porsche 918 Spyder that held the record until now. The sum total is a bragging-rights sheet of lap records set at 13 tracks across these United States. And you don't have to take Dodge's word on that. The records have been certified by the Sports Car Club of America (SCCA), cementing the ACR's place in the record books. Nice work if you can get it, and you can scope it out in the video above and press release below. Related Video: 2016 Dodge Viper ACR Is Undisputed Track Record King - Ultimate street-legal race car sets new high-performance benchmark with more track records than any production car in the world - Sports Car Club of America (SCCA) has certified lap records at 13 road courses, including world-famous Laguna Seca, Road Atlanta and Virginia International Raceway - With 645 horsepower and more torque than any naturally aspirated engine in a production car, the ACR is purpose built for weekend club racers who want the most extreme, but street-legal, track car available - Significant aerodynamic and suspension upgrades, new Carbon Ceramic brakes with six-piston calipers from Brembo and high-performance Kumho tires, specifically designed for the new 2016 ACR, set this Viper apart on any road course November 3, 2015, Auburn Hills, Mich.