Showing posts with label fuel efficiency. Show all posts
Showing posts with label fuel efficiency. Show all posts

30 September 2008

News outlets starting to understand electric car drawbacks

I was pleasantly surprised upon reading this article about converting hybrid cars to electric plug-ins that CNN is finally starting to acknowledge that electric cars are not the be-all end-all solution some people think they are.

The problem is that the electricity has to come from somewhere, and right now around 70% of the electricity in the US comes from fossil fuels (50% from coal burning, even). It's *better* than using gasoline though for a few reasons - such as that remaining 30% that comes from water, wind, solar, and nuclear (which technically is also non-renewable, but does not have the greenhouse gas problems of fossil fuels instead adding disposal problems). In addition there is economy of scale in power plants - rather than having a small engine and generator inside the car, power plants have a number of large ones. These tend to be much more efficient in terms of both higher power output compared to fuel input, and also lower pollution output compared to fuel input. Because of both of these higher efficiencies, the energy from plants tends to cost less than the energy from gasoline.

So in the end, yes it's good to change your car to electric only, but you will still be paying a higher electricity bill in the place of a gasoline bill, and it's NOT a perfect solution as of yet. Fuel cell cars also aren't a perfect solution, but with more research we'll continue to improve our options.

26 May 2008

European Fuel Economy

Now this's interesting. I'd always heard that European cars in general get higher fuel efficiency than US cars, so I looked it up briefly. Wikipedia, for example, says that a typical European car gets 47 mpg highway, 36 mpg city [Wikipedia: Gas mileage]. But then I checked the Smart Fortwo specifically, since it's got such horrible gas mileage. The exact same model of car the EU rates as 50 mpg while the US rates it as 36 mpg [Wikipedia: Smart Fortwo].

This makes me question our testing methods, and whether European cars really do get better gas mileage than ours. I mean, if we don't test things the same way, it's comparing apples and oranges. Anyone know more about this?