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The tricky business of octane, power, and MPG

Given tepid green-car sales numbers this year, consumers in the US aren't making the transition away from internal combustion engines too quickly. Regulations are still mandating cleaner emissions, though. In addition to downsizing and turbocharging, there's growing consideration about moving to higher-octane fuel to improve overall efficiency. In a new report, engineers at FCA, Ford and General Motors Powertrain are showing that it could work, too. The major advantage to higher-octane fuel is that it supports higher compression ratios. That in turn can lead to more power from burning the same amount of gas. "Higher ethanol content is one available option for increasing the octane ratings of gasoline and would provide additional engine efficiency benefits for part and full load operation," the researchers write in the study's abstract. The authors even think it could be possible to update some modern vehicles' engine calibration to be optimized for the better gas. While the benefits are there, we still have a long way to go before higher-octane fuel becomes a national standard. According to Green Car Congress, 87 percent of the gas sold in the US is regular grade 87-octane. Meanwhile, premium 91-93 octane makes up just 10 percent. The various grades of fuel illuminate even more annoyances with the current system. For example, Ford generally recommends 93-octane for EcoBoost engines, and the power outputs that the company publishes are based on using it. However according to Green Car Reports, such premium gas is very difficult to find in some regions of the US, especially along the West Coast. The powertrains still run on lesser grades but with lower power output. The researchers' discussion of possibly increasing ethanol in gas also comes during a heated debate on the substance. The current administration is pushing for less of the corn-based fuel in the coming years. Although, several presidential hopefuls might be favor of reversing that course.

Why the 2015 Detroit Auto Show will be the best since The Crisis

The Detroit Auto Show clearly has its swagger back, and the 2015 edition will be a veritable feast for the enthusiast senses. We're talking serious performance, and it will be exhibited in a variety of forms. Sports cars. Supercars. Muscle-bound luxury cars. They're all set for splashy debuts in January in the Motor City. It's another signpost that companies have recovered from the global economic crisis that gripped the industry from 2008-09. For a while, automakers played it safe at Detroit and other shows. Environmentally friendly cars were important, especially for General Motors and Chrysler that were living on loans from Uncle Sam. Ford, Toyota and other companies generally focused on their best-selling or core models. With a few notable exceptions, recent auto shows have been a bit more buttoned-down than in the past. Boring probably isn't the right word, but austerity has been reality. That's changing. Car companies are making money. Sales are up. Aside from the many nagging recalls – and they are notable – the industry now has the time and energy to make performance cars a priority. That will be offered in hard evidence in Detroit. A year from now when we look back at this auto show, we'll sum it up with one word: Horsepower. But make no mistake, this isn't frivolous. Sports and luxury cars are expensive. They're profitable. They boost images and highlight strengths. With that in mind, here are five significant performance-oriented reveals to watch for when the show kicks off in less than two weeks. 2016 Acura NSX Acura's reborn NSX is a strong bet to earn plenty of votes for our Editors' Choice awards. It's one of the most anticipated – and strung-out – reveals of the year. Think back: we actually saw an NSX concept at the 2012 Detroit show, and Acura has spent the last three years teasing the car in a variety of ways. The slow burn, however, means we know a lot about the NSX. It's will use a mid-mounted twin-turbo hybrid powertrain and run with all-wheel drive. It will also wear an innovative zirconium e-coat paint, a new paint process that Honda says is more environmentally friendly. Honda has also said it will build the new NSX in Ohio, where a large part of the car's development work has been done. The original NSX was produced from 1990-2005 and helped establish Acura's performance credentials in the United States. It was a landmark car and a shot across the bow of Ferrari, Lamborghini and others.

Are you a new Ford Mustang SVO? [w/video]

When Ford announced that its 2015 Mustang would arrive with a 2.3-liter EcoBoost four-cylinder engine, three letters came to mind: SVO. While Ford hasn't said a word regarding the rebirth of a Mustang SVO model, this latest set of spy shots shows us something very, very interesting. Allow us to explain.
The Mustang prototype in these photos looks very similar to the GT500 test cars we've spotted before - same bulging hood, aggressive front fascia and air vents aft of the front wheels. What's different, however, is around back. Have a look at the exhaust, and note that instead of the GT500's usual quad pipes, two of the exhaust outlets have been capped off.
Our spies point out that these exhaust outlets could be closed for some sort of emissions testing or another engineering reason, but it's also important to note that the engine and exhaust notes of this car sound completely different from earlier GT500 prototypes. We've got a video below that compares the two.