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2016 Toyota Mirai Fuel Cell Vehicle likely to get 60 MPGe

Toyota isn't talking about the Mirai's fuel economy just yet, but that doesn't mean we can't make an educated guess. And we do so by looking at the competition and knowing that the DOE says that "One kg of hydrogen is roughly equivalent to one gallon of gasoline." For now, the Mirai's H2 competition means the 2015 Hyundai Tucson Fuel Cell. It can carry 5.64 kg of hydrogen and has a range of 265 miles. If we do the division there (265/5.64) we get 47 miles per gallon equivalent (MPGe). The DOE says that the miles/kg values are 49 combined, 48 in the city and 50 on the highway while Hyundai lists the official MPGe estimates as 50 combined, 49 city and 51 highway. The simple math gets us pretty close to these official numbers. Or take the 2014 Honda FCX Clarity. With a range of 231 miles and a max of 3.92 kg of hydrogen on board, division gets us to 59 MPGe. Officially, it's rated at 59 miles per kg (combined), with 58 in the city and 60 on the highway. In other words, simple math is a reliable way to calculate rough MPGe. So, we know that the Mirai can hold five kilograms of hydrogen on board and that the car has a 300-mile range. We don't even need a calculator to figure out that the Mirai is looking at 60 MPGe. Interestingly, that might be what the next-gen Prius will get.

Toyota throwing water on fast-charging EVs

Toyota is undoubtedly committed to moving beyond the internal combustion engine for future automobiles. But, while the company embraces hybrids with boosted production, new models and in motorsports, the automaker is more standoffish when it comes to pure electric models. This is especially true as the Mirai hydrogen fuel cell sedan comes to market. In the mind of Mirai chief engineer Yoshikazu Tanaka, even fast-charging electric vehicles don't have much of a future because of their strain on the power grid. "If you were to charge a car in 12 minutes for a range of 500 km (310 miles), for example, you're probably using up electricity required to power 1,000 houses," he said to Reuters. Tanaka admitted that EVs have a place in the market, but it was for short drives during the day after being charged each night. As one of the people responsible for bringing the Mirai to the road, it shouldn't be too shocking that Tanaka puts his faith in hydrogen. He feels that H2 is the better choice for long-distance driving because of the available range and speed of refueling. "Of course, there are technological hurdles that need to be cleared to make this commercially viable," he said to Reuters. One of the biggest of those obstacles is building a new refueling infrastructure. But, despite government subsidies, Japan looks set to miss its goal of opening 100 H2 stations by the end of March 2016. Toyota has thrown a lot of support behind hydrogen but has been accused of overstating some of the fuel's benefits and embellishing the current refueling infrastructure. Still, engineers at the automaker are working to bring the cost of the fuel cell vehicle down to the level of a diesel by 2022.

Toyota to buck engine downsizing trend, may go larger and turbo-free

Turbocharging isn't really Toyota's specialty, and the Japanese automaker isn't being shy about acknowledging it. Koei Saga, a senior managing officer in charge of drivetrain research and development, says that eschewing turbos and increasing displacement of engines using the Atkinson cycle can produce better power gains without sacrificing fuel economy, Automotive News reports.
Toyota is investing heavily in larger-displacement Atkinson-cycle engines in addition to turbocharged engines, but Saga doesn't think the automaker will use turbocharging across many product lines. He apparently remains unconvinced that the technology "makes the world better."
In Toyota's eyes then, Atkinson cycle engines do make the world better, and here's how. Their pistons complete four processes - intake, compression, power and exhaust - in one revolution of the crankshaft, and the power stroke is longer than the compression stroke. Traditional Otto cycle engines require two crankshaft revolutions to accomplish those same four operations and have equal-length compression and power strokes. Atkinson cycle engines are more efficient, but less power dense, though increasing displacement can offset that shortfall.