The new Chevy Volt is EPA rated at 230 mpg. In advertisements it sounds almost too good to be true. I believe it is, and I’m not alone. Fuel powered vehicles run less efficient at low speeds and more efficiently at speeds approaching highway speed. Hybrid powered vehicles run efficiently at various speeds until the batteries are discharged and the gas powered motor kicks in to power the generator to recharge the batteries. If you factor in the times when the vehicle is running only on gas it would drop to around 50mpg or less. Either vehicle consumes more energy when speed reaches 65 mph and above due to wind resistance.
GM claims that the new EPA methodology will be stated in terms of kWh per 100 miles traveled, and that by this metric, the Volt will go 100 miles on 25 kWh of battery charge. This seems a less than perfect way of rating the fuel economy, since the Volt will only run 40 miles on a charge before the gasoline generator kicks in. To arrive at the 230 mpg number, GM assumes a 51-mile driving cycle with drivers charging up their Volts once a day, so the battery powers 4/5 of the distance.
Taking GM’s claim at face value though, we can calculate that the Volt gets about 4 m/kWh. This can be compared to approximately 0.8 m/kWh for a typical European diesel car getting an average 40 mpg, or about 0.4 m/kWh for a typical American gasoline car getting an average of 20 mpg. (Newer models have a range of higher fuel economies, but those are the averages of the current fleets.)
For a little more on the subject go here for a blog post by a former Tesla officer’s blog post and links to like sites.
And what about cost per mile? It is quite possible the cost per mile for the Chevy Volt is at eight cents per mile. If this figure is proven correct, the cost per mile is the same as a gas powered car. But what if gas prices go up again? Let’s say $6 a gallon in 5 years. If cap and trade goes through it could at least double our utility bills making the charging of the battery packs more expensive. So once again it would be draw between the hybrid and a gas powered car that got 40 mpg.
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