The gas engine also shuts down during temporary stops in both of these modes.
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It will store 16 kilowatt-hours of electricity--enough to travel 40 miles without assistance from the gas engine.
The Energi has a nominal all-electric range of 21 miles, after which the gas engine comes whispering onstage.
If you are really gentle with the accelerator, you can reach highway speeds without ever switching on the gas engine.
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Some of the upcoming 2013 models will give you a choice between an efficient gas engine or an electric powertrain.
The Volt is a plug-in hybrid with 25 to 50 miles of electric range, and another 300 from its gas engine.
The Volt also will have a small gas engine onboard to recharge the battery for trips of more than 40 miles.
And we lose against the Leaf because we have a gas engine.
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Many Volt owners will hardly ever use the gas engine, and it rarely kicked in during my four days with the car this month.
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According to Schorr, the C-X75 will have three modes: full electric, and with the gas engine either partly supplementing the electric motors or fully engaged.
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Plus, using the six-cylinder gas engine is part of a larger strategy to apply the hybrid powertrain to various models, including the 5 Series and 7 Series.
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The powertrain, which we saw earlier on a concept car, combines a V6 bi-turbo gas engine with a 95 horsepower electric model for 416 total system horsepower.
The Jaguar, with two electric motors and a supercharged 1.6-liter gas engine (the show car version actually uses two microturbines) can manage more than 30 miles on the batteries.
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For many, the Volt will be an electric car most of the time, though the onboard computer does tell the gas engine to drive the wheels now and then.
The 2.5-liter inline 4-cylinder gas engine and permanent magnet AC synchronous electric motor in the MKZ deliver 191 net horsepower, a modest amount of power for a 3, 752 lb vehicle.
It will also have an electric mode that allows the car to drive 12 miles or less at speeds up to 30 miles per hour without using the gas engine.
If you are really gentle with the accelerator, you can supposedly get up to highway speed (62 miles per hour) on pure electricity, without the gas engine ever kicking on.
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In an ironic twist, one of the showstoppers is the VL Destino, which strips the Karma of its electric drive-train and inserts a fire-breathing, 638-horsepower Corvette ZR-1 gas engine in its place.
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Because peak power arrives at different rpm for the gas engine and the electric traction motor, peak system horsepower nets out to be an even 200 hp at 5, 600 rpm, which is the rated redline.
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Rob Peterson and Britta Gross of GM, both integral to the Volt program, dare me to guess when the car switches from battery-only to using the gas engine as a generator, and I totally miss it.
The Green Book, produced by the American Council for an Energy-Efficient Economy (ACEEE), says that in evaluating plug-in hybrids, it considers both the emissions from the gas engine and from the power plants that feed the grid.
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The vibe in the Fusion Hybrid is one of abiding integration: the subtle slurring of ratios in the continuously variable transmission, the share-the-load cooperation between electric and gas engine (2.0-liter, 141-hp Atkinson-cycle four-cylinder), a sort of light, transparent flickering of power sources.
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Meanwhile, auto makers are proving there's still plenty of potential in the gas-powered engine to meet customer's fuel-efficiency demands.
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Cummins is leading global manufacturer of diesel and natural gas engines, engine-related component products, and electric power generation systems.
Inadequate in the smaller Jetta and a cruel joke in the Passat, the 2.5L will be replaced with a small-displacement gas-turbo engine for model-year 2013, and not a second too soon.
When the battery is depleted (or when driven at very high speeds), the premium-gas internal combustion engine powers the car, but its fuel mileage suffers from having to shove around 400lbs of batteries.
If drivers of premium-required cars try to burn regular gas, they could damage their engine due to high exhaust-gas temperatures and knocking.
Aston Martin is showing a new version of its four-door Rapide, which uses a gas-chugging V12 engine.
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But the problem is that it takes a lot of natural gas to isolate the hydrogen, leaving many to say that it would be more productive to just combust the natural gas in a conventional engine.
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