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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.

Edmunds ranks the best used cars for 2013

When people ask us what car we would recommend for them, it's usually not easy to answer. To make a useful recommendation we must consider which of the numerous vehicle segments fits their needs best, and then choose one of the many vehicles offered in each segment. For some people, new cars don't meet their expectations of value, because they lose so much of it the moment they are purchased and driven off the dealer lot. For them, there's always the used-car market, where great deals can be found, but cars' histories of reliability and maintenance records - and perhaps that Certified Pre-Owned warranty - become ever-important factors playing into purchase choice.
To help out, Edmunds has done us the favor of assembling a list of the best used vehicles money can buy, covering model years 2006-2011, according to what it considers the most important criteria when shopping for used autos: reliability, safety, value and availability. That means unreliable, unsafe, super-expensive or limited-edition models don't appear on the list, but instead cars from each segment that are more likely to satisfy the general population.
There are some real goodies on the list, including but not limited to vehicles such as the capable Honda Fit, the cultish Honda Accord coupe (which can be had with a 240-horsepower V6 and a six-speed manual transmission some years), and the powerful Chevrolet Corvette. While Edmunds' choice of the Volvo C70 for best used convertible baffled us at first (not that it's a bad car), it redeemed itself by stating that the Mazda MX-5 still is an unofficial top choice if you don't require more than two seats.

Ford rolls out diesel Focus ST at Goodwood [w/poll]

If you're in the market for a hot hatch, there are some excellent choices at your disposal - especially if you live in Europe. But if you want a diesel, well, your choices become rather more limited. Volkswagen tends to that niche market with the Golf GTD (essentially an oil-burning version of the GTI available Stateside), but that's about the extent of it. The pleas of those looking for more diesel-burning hot hatch choices haven't fallen on deaf ears at Ford, with the Blue Oval not only rolling out a facelifted gas-powered Focus ST at the Goodwood Festival of Speed this weekend, but also a new diesel version as well.
The diesel Focus ST (which we hope and pray isn't marketed as the STD) packs a 2.0-liter turbodiesel four producing 182 horsepower and 295 pound-feet of torque to propel the oil-burning hot hatch to 62 in 8.1 seconds en route to a top speed of 135 miles per hour. With less power and only slightly more torque, that makes the diesel Focus ST considerably slower than the gasoline one, which packs 252 hp and 270 lb-ft, runs to 62 in 6.5 seconds and tops out at 154 mph, but (in a testament to how far particulate filters have come) the diesel model cuts carbon emissions by nearly a third compared to the petrol version and returns about 50-percent better fuel economy, which makes that much more of a difference in markets where diesel is already priced better than gasoline at the pump.
For buyers who wouldn't consider anything other than a diesel, it also represents 23-percent more power than the previous top-level diesel Focus. The VW Golf GTD, for reference, offers up 181 hp (just 1 horse less), 280 lb-ft (15 fewer torques) but is somehow estimated to reach 60 in a considerably fleeter 7.4 seconds.