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Originally Posted by magilly00
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Is the diesel not available here because it's not 50-state ready or because smart doesn't want to import them?
And to be fair, 85 MPG is using those British gallons, which are ever-so-larger (20%) than ours. Nonetheless, 70 MPG, if realistic in our EPA test cycle, is impressive. Enough to draw big attention to the brand. One would think that would be a powerful marketing tool.
I'm in favor of other simple options that could bump our MPGs enough. I'm not sure of the total additional cost, but if our cars had electric power brakes, we could easily have an auto shutoff feature when the car goes under 5 MPH with the brakes applied. Simply shutting off the engine like that at stop lights would be good for a 5% real-world city economy gain, though our EPA test cycle's short stop times wouldn't completely reflect that. (Citation: Car & Driver, June, 2010, page 110). In other words, we'd all see the increased mileage as owners, but it wouldn't fully show up on the sticker where people make their pre-sale determinations.
That same article references an Ecomotors-designed OPOC two-stroke, two-cylinder engine that produces 75 hp and is 15% more efficient than a typical four-stroke. (This two-stroke is nothing like the oil-gas mixed two stroke engines of old motorcycles, chain saws and lawn equipment that may come to mind).
A more realistic near-term alternative could be direct fuel injection. Combined with a lean combustion, that could gain up to 8% economy. Coupled with the auto-start-stop, we could see decent interim gains in fuel economy to "keep up with the Joneses" until the next major engine arrived. That could yield EPA numbers of 35-36/44 city/hwy, though the real-world city numbers could realistically be 37 or 38.
I'm not sure if those changes could be packaged without costs increasing too much, though. Adding $500 in cost to a smart is a much bigger factor than on a $30K car.