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The most efficient gas or hybrid cars of 2024: Not the greenest, but still very green

Not a single electric vehicle appears on the “greener choices” list assembled by the American Council for an Energy-Efficient Economy (ACEEE) in its annual compilation of the most environmentally friendly cars in the United States. But for potential car buyers seeking an efficient, fairly affordable gasoline or hybrid vehicle this year, the list of 12 cars, trucks and SUVs can help with decision making. Topping this yearÂ’s list was the gas/hybrid Honda Accord, priced at $33,990 with an estimated annual fuel cost of $982. Rank Make & Model Powertrain Vehicle Class Green Score MSRP Estimated Annual Fuel Cost* 1 Honda Accord Gas Hybrid Large Car 62 $33,990 $982 2 Kia Niro FE Gas Hybrid Compact SUV 61 $28,315 $885 3 Mitsubishi Mirage Gas Compact Car 59 $17,955 $1,189 4 Lexus ES 300h Gas Hybrid Midsize Car 59 $44,590 $1,073 5 Lexus NX 350h Gas Hybrid Midsize SUV 57 $43,465 $1,207 6 Ford Maverick Gas Hybrid Compact Pickup 55 $24,900 $1,297 7 Toyota Sienna Gas Hybrid Minivan 55 $39,080 $1,304 8 Mini Cooper Convertible Gas Subcompact Car 54 $35,700 $1,412 9 Toyota Highlander Gas Hybrid Large SUV 54 $40,720 $1,348 10 Kia Soul Gas Small Wagon 53 $21,565 $1,467 11 BMW Z4 sDrive30i Gas Two-Seater 50 $53,600 $1,626 12 Mercedes-Benz GLA250 Gas Hybrid Large Van 49 $43,000 $1,596 13 Volvo V90CC B6 Gas Hybrid Midsize Wagon 45 $59,800 $1,843 14 Ford Ranger Gas Standard Pickup 43 $32,670 $1,968 *ACEEE analysis using EIA data of the annual cost of driving 15,000 miles In making its evaluations, the ACEEE examines each 2024 model based on its cost to human health from air pollution associated with vehicle manufacturing and disposal, the production and distribution of fuel or electricity, and vehicle tailpipe emissions. The group also takes into account air pollution associated with EV battery manufacturing. The organization also ranks what it calls the “greenest” cars — it selected the Toyota Prius Prime SE plug-in hybrid is the greenest model of 2024. As well as the “Meanest.Â’Â’ or least efficient vehicle. At the top of that list this year was Mercedes-Benz AMG G63. The group says that the greener choices are those that are available nationwide “with among the lowest environmental impacts in each vehicle class but that didnÂ’t make the Greenest List.

Honda patents engine with different cylinder displacements

A basic rule of engine design states that the displacement of a cylinder is equal to the engine's total displacement divided by its cylinder count. Honda, according to a recently surfaced Japanese patent, is looking to break that rule with an engine containing cylinders of different sizes. We've done our best to translate it from patent-ese. The idea is that different-sized combustion chambers give more flexibility when any combination of cylinders are deactivated, or rested. Because the different numbers can be combined in various ways, it provides more and smaller increments than would an engine with equal-displacement cylinders. Take a 2.0-liter four-cylinder, for example. Following the golden displacement rule, each of the four cylinders has a volume of 500 cc, giving displacement increments of 500 cc when any cylinder is deactivated. But suppose instead that the four cylinders displace 300, 425, 600, and 675 cc, respectively. This would give the engine 15 available displacements instead of just four, and the spacing between each option would be far less than 500cc. As a result, those different virtual displacements would provide more adjustment between power and efficiency than a cylinder-deactivation system can on a conventional engine. Honda's patent describes cylinders with equal bore size, with the displacement from cylinder to cylinder varying based on the crank throw radius – the longer the throw, the longer the stroke and the larger the displacement of that particular combustion chamber. The patent describes how the cylinder sizes would need to be arranged to spread the load on the crankshaft and presumably limit vibration that would be introduced by the different pulse magnitudes. If we're interpreting things correctly, the largest cylinder (the one with the longest crank throw radius) sits in the middle of the bank with the smaller ones alternating on either side as they decrease in displacement. This concept is described for multi-cylinder inline and V-type engines of various sizes. The patent was filed in March of 2014 and published in January of this year. Whether or not this arrangement will reach production is of course unknown, but the advantages in terms of both efficiency and power seem promising. Related Video: News Source: Japan Patent Office via Auto Guide Green Honda Fuel Efficiency Technology patent

Honda MC-? will use solar-powered chargers in 'micro' EV tests

Honda is envisioning what it calls a CO2-free society and, not surprisingly, it's a rather sunny one, in one Japanese city, at least. The Japanese automaker is kicking off a test program with the micro-electric-vehicle that will use power generated via photovoltaic energy collected and stored at EV charging stations. Yes, the big old sun will power those little-bitty MC-? cars. MC-? is shorthand for "Micro Computer Beta" and the car is certainly an appropriate vehicle for these tests. The car is 98 inches long (about eight inches shorter than a Smart ForTwo) and has a 43-mile-per-hour top speed as well as an electric motor that delivers a meager eight horsepower. The car is designed to meet Europe's quadricycle regulations and has a 50-mile single-charge range. No word on if or when it'll go into production, of course, but Honda and Toshiba are working with Japan's Miyakojima City on the project, with Toshiba responsible for building three solar-powered EV-charging stations. The Japanese automaker unveiled the latest incarnation of the 1+1 tandem-seating-arrangement MC-? last fall. You can see our "Quick Spin" impressions of the model here and read Honda's press release below. Honda Begins Experimental Test-driving of MC-? Micro-sized EV Using Renewable Energy TOKYO, Japan, January 28, 2014 - Jointly with Miyakojima City and Toshiba Corporation, Honda Motor Co., Ltd. began experimental test-driving of the MC-?, Honda's micro-sized EV, using photovoltaic (PV) energy as part of the Miyakojima City Small-sized Electromotive Mobility Project*1. Through this experimental program, Honda will operate an environmentally-responsible micro-sized EV using renewable energy, and work together with the local community to explore the possibility of a CO2-free society. In November 2013, Honda began separate field tests jointly conducted with Kumamoto Prefecture, Saitama City and Miyakojima City using the MC-?. For the field tests in Miyakojima City, as a part of the initiative as an environmentally-responsible model city, the feasibility of the introduction and utilization of small-sized electromotive mobility products and electricity supply facilities are being verified. For this particular driving experiment in the city using renewable energy, the MC-? will be charged from three new PV recharging stations newly built by Toshiba.