5 Gas-Saving Technologies to Shop For
With gas prices beginning to spike upwards to their highest levels in four years, rising costs at the pump might affect your new car buying plans. If you haven’t been in the market for some time, here are five fuel saving technologies that you may want to look for when considering your next purchase.
Many new vehicles have systems that automatically stop and restart your engine when your vehicle comes to a rest at light for more than five seconds or so. Manufacturers are employing the systems to eke out the maximum fuel economy from all their vehicles in order to meet federal fuel economy standards. Some of the early systems were quite crude, but refinements in the newer systems make the transitions much smoother. Look for systems that can be switched off if you find the constant stop/start sequences annoying.
Hybrid/Plug-in Hybrid Technology
Combining electric power with conventional internal combustion technology is another way that manufacturers have found to stretch mileage. Standard hybrid technology continues to improve: the Toyota Prius is a case in point, where the current model is rated at 55 mpg. Typically, conventional hybrids are cheaper than their plug-in counterparts. But there’s something else to consider in that plug-in technology allows you, depending on model, anywhere from 20 to 50-plus miles of pure EV operation before the engine kicks in. Theoretically, if your commute is short enough, you could go quite some time without putting any gasoline in the tank. Another factor that offsets the higher price of these vehicles is a federal tax credit that varies depending on the pure EV range of the vehicle. The range of plug-in versions is wide, from hatchbacks like the Prius Prime and Chevrolet Volt to minivans like the Chrysler Pacifica Hybrid.
Continuously Variable Transmissions
Automakers are turning to continuously variable transmissions (CVTs) to also improve fuel economy. The rationale behind these so-called step-less or gearless transmissions is that they try to keep the engine turning at a constant rpm to maximize efficiency. While this looks great on paper, there have been some drivability issues with CVTs, such as droning or “motorboating” where the transmission keeps the engine revs up in the most efficient portion of the torque band. The other drivability concern is the elastic or “rubber band” aspect of acceleration where it feels as if the car is catching up to the engine’s output. Manufacturers have addressed some of these issues by putting in artificial steps like gears that can be controlled with paddle shifters, allowing the driver to select a more normal-feeling rev range to match the vehicle’s speed. As for elastic acceleration, Toyota has added a conventional first gear to the CVT in its new Corolla hatchback. This gives the vehicle a more natural feel off the line while taking advantage of the CVT’s efficiency at higher speeds.
Sailing or Gliding Mode
Back in the day, some people with manual transmissions would coast with the vehicle in neutral as a fuel-saving technique. Manufacturers are beginning to mimic this approach by decoupling the engine from the transmission when your foot is off the accelerator. This allows the engine to drop down to a fuel-saving idle and not become a drag on the vehicle, allowing it to coast more freely. What you gain in fuel economy you also lose in the car’s ability to use the engine for braking, which may in turn, result in additional brake wear in vehicles equipped with this technology.
Intelligent Cruise Control
More and more vehicles are offering intelligent or adaptive cruise control that will essentially follow traffic even in stop-and-go scenarios. That ability in and of itself can save fuel by more consistently controlling the vehicle’s speed than your right foot. But another layer is already filtering into high-end production cars where a terrain-based navigation system actually anticipates curves and hills and adjusts the vehicle’s speed accordingly. This means smoother power application and braking and as a result greater fuel savings.