Is GM Volt claim of 230 mpg a joke?

I think they have been performing some creative calculus. Normally, the MPG is calculated on in-car energy production alone. However, the GM Volt will drive the first 40 miles using an external charge (plugged into the normal power grid during night).

Only above those 40 miles, the normal fuel engine kicks in to provide the excess electricity needed. GM has not revealed in any way HOW they calculated the 230 MPG claim, and EPA, the official office that performs measurements for these claims has not performed any tests yet. It is very well possible that GM has somehow put those extra 40miles into the calculation, plus some very optimistic assumptions, to reach this extravagant claims.

Still, if they are able to reach 100mpg, that would already be a huge improvement over the current GM gas-guzzling cars, AND a welcome addition to the hybrid market as well. So, let's hope they can at least achieve half of their claim, and let the green car revolution begin!

The claim is a bad joke. The actual mileage is somewhat less than that of the Prius but the electric car, of course, does not use any gas until the battery needs to be recharged by the gas motor. By shuffling when to start counting GM is making its misleading claim.

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