1965 Ford Falcon on 2040-cars

Auto blog

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.

Motor Trend pits Subaru WRX vs. Ford Focus ST

The Ford Focus ST has enjoyed a relatively calm, if brief, reign in the world of hot hatches. With nothing else in the class (in the States, at least) but the aging Mazdaspeed3 and Subaru Impreza WRX and the slow-selling Volkswagen Golf R, the Blue Oval's 252-horsepower five door has been the go-to vehicle for those that don't need the high-octane lunacy (and expense) of the rally bred Subaru Impreza WRX STI and Mitsubishi Lancer Evolution X.
Now, though, as the new Subaru WRX (it's not an Impreza anymore, though, neither is it a hatchback...) starts to arrive at dealers, the Focus ST appears to be under threat for the first time. Naturally, Motor Trend is here to figure out which one is the best, with another one of its Head 2 Head videos. Host Jonny Lieberman puts both cars through their paces, going above and beyond, quite literally, at the very end of the video.
Have a look below and let us know what you think of MT's verdict in Comments.

2014 Roush Stage 3 Mustang

Up until now, it's been some years since I managed to get behind the wheel of the hot Mustangs tuned by the folks at Roush Performance. My memories of those vehicles are fond, as the Roush up-fits usually make for better-driving examples of the iconic Ford pony, with better-tuned suspensions, excellent short-shift kits and, of course, huge additions of power. The wake-your-neighbors aural characteristics of these cars have been nothing short of outstanding, too.
But in the years since my last experience with the Roush formula, Ford's own development team has churned out some pretty potent 'Stangs. We currently live in a world where the Blue Oval will sell you a Mustang with 662 horsepower from the factory, and the recently departed Boss 302 remains one of the best Mustangs - and best sports coupes - the Autoblog crew has ever driven.
So with great-driving and hugely powerful Mustangs coming straight off the line at Ford's Flat Rock Assembly Plant, does the Roush package still offer that extra special something to make it stand out? I spent a week with a Stage 3 coupe to find out.