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Nuclear-powered concept cars from the Atomic Age

In the 1950s and early 60s, the dawn of nuclear power was supposed to lead to a limitless consumer culture, a world of flying cars and autonomous kitchens all powered by clean energy. In Europe, it offered the then-limping continent a cheap, inexhaustible supply of power after years of rationing and infrastructure damage brought on by two World Wars.
The development of nuclear-powered submarines and ships during the 1940s and 50s led car designers to begin conceptualizing atomic vehicles. Fueled by a consistent reaction, these cars would theoretically produce no harmful byproducts and rarely need to refuel. Combining these vehicles with the new interstate system presented amazing potential for American mobility.
But the fantasy soon faded. There were just too many problems with the realities of nuclear power. For starters, the powerplant would be too small to attain a reaction unless the car contained weapons-grade atomic materials. Doing so would mean every fender-bender could result in a minor nuclear holocaust. Additionally, many of the designers assumed a lightweight shielding material or even forcefields would eventually be invented (they still haven't) to protect passengers from harmful radiation. Analyses of the atomic car concept at the time determined that a 50-ton lead barrier would be necessary to prevent exposure.

2015 Hennessey Ford Mustang hits 207.9 mph

After hitting over 195 miles per hour a few months ago, John Hennessey was barely out of his personal HPE700 Mustang before he said that 200 mph was achievable. Don't doubt a man who knows a ton about taking cars to insane speeds. With the new HPE750 Mustang, he and his customers can finally surpass the 200-mph mark in their cars. "If at first you don't succeed, just add more horsepower and rpm and try again," Hennessey said in the company's announcement. Rather than the 717 horsepower and 632 pound-feet of torque from the supercharged 5.0-liter V8 in the HPE700, the HPE750 ratchets the same powertrain up to an even more potent 774 hp and 648 lb-ft. In a real show of confidence, the Hennessey team brought along Jay Leno when it returned to the Continental Tire Proving Grounds in Uvalde, TX, to set a new top speed with the HPE750. The upgrades to the Mustang definitely paid off because the pony car reached a GPS-verified 207.9 miles per hour down the straight. The run will eventually appear on a segment on the upcoming Jay Leno's Garage TV show that will air CNBC. Prices for the HPE750 start at $59,500 USD, including the base 2015 Mustang GT, but building an exact replica of this one would cost $69,374, according to Hennessey. In addition to the huge top speed, the company claims that the coupe can reach 60 mph in 3.4 seconds and cover the quarter mile in 10.9 seconds. 774 HP Hennessey Mustang Tested to 207.9 mph Jay Leno visits Texas tuner for upcoming TV series on CNBC June 2, 2015 Uvalde, Texas—On Wednesday, May 27, 2015, professional driver, Brian Smith, drove the Hennessey HPE750 Supercharged Mustang to a top speed of 207.9 mph. In the process, Hennessey's potent pony car became the first 2015 Mustang to break the 200 mph mark. Jay Leno was on hand to witness the record speed while filming an upcoming episode of Jay Leno's Garage, which will air on CNBC later this year. The run was made on the 8.5 mile high speed oval at the Continental Tire Proving Grounds located in Uvalde, Texas – the same test track where John Hennessey test drove the company's HPE700 Mustang to a top speed of 195 mph back in February of this year. During both tests, speeds were validated with Racelogic's VBox 3i GPS data logging system. "If at first you don't succeed, just add more horsepower and rpm and try again," said company founder and president, John Hennessey.

The most efficient gas or hybrid cars of 2024: Not the greenest, but still very green

Not a single electric vehicle appears on the “greener choices” list assembled by the American Council for an Energy-Efficient Economy (ACEEE) in its annual compilation of the most environmentally friendly cars in the United States. But for potential car buyers seeking an efficient, fairly affordable gasoline or hybrid vehicle this year, the list of 12 cars, trucks and SUVs can help with decision making. Topping this yearÂ’s list was the gas/hybrid Honda Accord, priced at $33,990 with an estimated annual fuel cost of $982. Rank Make & Model Powertrain Vehicle Class Green Score MSRP Estimated Annual Fuel Cost* 1 Honda Accord Gas Hybrid Large Car 62 $33,990 $982 2 Kia Niro FE Gas Hybrid Compact SUV 61 $28,315 $885 3 Mitsubishi Mirage Gas Compact Car 59 $17,955 $1,189 4 Lexus ES 300h Gas Hybrid Midsize Car 59 $44,590 $1,073 5 Lexus NX 350h Gas Hybrid Midsize SUV 57 $43,465 $1,207 6 Ford Maverick Gas Hybrid Compact Pickup 55 $24,900 $1,297 7 Toyota Sienna Gas Hybrid Minivan 55 $39,080 $1,304 8 Mini Cooper Convertible Gas Subcompact Car 54 $35,700 $1,412 9 Toyota Highlander Gas Hybrid Large SUV 54 $40,720 $1,348 10 Kia Soul Gas Small Wagon 53 $21,565 $1,467 11 BMW Z4 sDrive30i Gas Two-Seater 50 $53,600 $1,626 12 Mercedes-Benz GLA250 Gas Hybrid Large Van 49 $43,000 $1,596 13 Volvo V90CC B6 Gas Hybrid Midsize Wagon 45 $59,800 $1,843 14 Ford Ranger Gas Standard Pickup 43 $32,670 $1,968 *ACEEE analysis using EIA data of the annual cost of driving 15,000 miles In making its evaluations, the ACEEE examines each 2024 model based on its cost to human health from air pollution associated with vehicle manufacturing and disposal, the production and distribution of fuel or electricity, and vehicle tailpipe emissions. The group also takes into account air pollution associated with EV battery manufacturing. The organization also ranks what it calls the “greenest” cars — it selected the Toyota Prius Prime SE plug-in hybrid is the greenest model of 2024. As well as the “Meanest.Â’Â’ or least efficient vehicle. At the top of that list this year was Mercedes-Benz AMG G63. The group says that the greener choices are those that are available nationwide “with among the lowest environmental impacts in each vehicle class but that didnÂ’t make the Greenest List.