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Top Gear drag races the BMW i8 and M4 to decide the future

The BMW M4 and i8 represent two every different expressions of the performance car. The M4 relies on its turbocharged six-cylinder combustion engine to spin the rear wheels. Conversely, the i8 packs a turbo three-cylinder and electric motors for its cutting-edge all-wheel drive system. Top Gear is the latest publication to put the pair together to find out which ethos is quicker. We saw Germany's Auto Bild hold a similar race last year, and the i8 scored a clear victory there. We don't want to spoil the winner of Top Gear's attempt, but we can tease that this sprint ends in a photo finish. Pick your favorite, and then watch the video to see which performance coupe takes the checkered flag. Related Video:

Toyota finds 10% MPG improvement in hybrid PCU

Keeping up its from-all-angles approach to efficiency, Toyota has found yet another way to eke out up to ten percent more precious MPGs in its hybrid vehicles, this time electronically. The automaker has announced the development of new silicon carbide (SiC) power semiconductors for use in power control units, which it will begin testing on Japanese roads within the next year. The PCU using the silicon carbide compound offers less electrical resistance, which improves efficiency when passing current between the battery and electric motor. It also loses less power after shutting off, and can operate at a higher frequency. The net power loss of the new PCU is just one-tenth of the current silicone-only version (the latter accounting for 20 percent of total electrical power loss in today's hybrids). The result, so far, is a claimed five-percent improvement in fuel economy in test vehicles, with the potential of ten percent by the time the new SiC power semiconductor comes to market. Additionally, the carbide wafers allow for smaller a power module, coil and capacitor, thus allowing the entire PCU to be 80 percent smaller (see the side-by-side comparison in the accompanying photo, which you can click to enlarge). We've got a while to wait before we start to see the carbide technology to start making a real-world impact. Toyota aims to begin using the SiC units in 2020. By then, with improvements in the company's other key efficiency factors - engine technology and aerodynamics - cars like the Prius will likely see significant gains in fuel economy. Read more in the press release below. Toyota Develops 'Diamond-like' Computer Chips to Boost Hybrid Mileage May 20, 2014 Toyota City, Japan – Toyota is using one of the hardest materials in nature after diamonds to develop a semiconductor chip it hopes will improve the fuel efficiency of its hybrids, such as the Prius, by as much at 10 percent. The company and its partners announced today that they have developed a silicon carbide (SiC) power semiconductor for use in automotive power control units. Toyota plans to begin test-driving vehicles with the technology on public roads in Japan within a year. The chips, made from carbide - one of the hardest materials in nature, theoretically have superior characteristics such as one-tenth the electrical power loss and 10 times the drive frequency. Toyota said the chips would also allow it to reduce the size of current automotive power control units by 80 percent.

IIHS: Drivers safer than passengers in frontal crash test

The Insurance Institute for Highway Safety introduced a small overlap frontal crash test in 2012 that replicates what happens when the front corner of a car impacts another object. In the test, vehicles travel at a speed of 40 mph toward a five-foot-tall barrier with 25 percent of the total width of the car striking the barrier on the driver side. One would assume that vehicles with good small overlap front ratings would protect the driver and the passenger equally. But a recent study from the IIHS proves that passengers aren't as protected as drivers. The IIHS conducted the test on seven small SUVs with good driver-side small overlap ratings and only one of the vehicles, the 2016 Hyundai Tucson, performed well enough to be given a good rating. The other SUVs performance ranged from poor to acceptable. After reviewing the results of the test, the IIHS is deliberating whether it should institute a passenger-side rating as part of its Top Safety Pick criteria. "This is an important aspect of occupant protection that needs more attention," states Becky Mueller, lead author of the study and an IIHS senior research engineer. "More than 1,600 right-front passengers died in frontal crashes in 2014." Since the small overlap front test was introduced, 13 automakers have made structural changes to 97 vehicles with roughly three-quarters earning a good rating after the adjustments. The IIHS' test for frontal ratings is completed with a dummy in the driver's seat and with a barrier overlapping the driver's side. Which makes sense, as passengers aren't always riding in a vehicle. "It's not surprising that automakers would focus their initial efforts to improve small overlap protection on the side of the vehicle that we conduct the tests on," states David Zuby, IIHS executive vice president and chief research officer. "In fact, we encouraged them to do that in the short term if it mean they could quickly make driver-side improvements to more vehicles. As time goes by, though, we would hope they ensure similar levels of protection on both sides." As the IIHS' test revealed, there's a massive difference in safety between the two front seats. Increase passenger safety, according to Mueller, would require automakers to strengthen the occupant compartment by using a different type of material or by making it thicker.