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Originally Posted by mfor4x4
found out by running vin numbers through the local GM dealership final drive ratios for a possible swap out of gears. A Chevy optra has final drive ratio of 3.56 compared to an Aveo's 3.94
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Interesting! Do you know if the final drives are actually interchangeable? You should definitely start a new thread about this if you're going to do it.
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I think the reason GM doesn't bring an excellent economy car to the American market ...
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Since this thread was originally started nearly 3 years ago, the fuel economy competition has really ratcheted up. Even the Aveo's fuel economy improved quite a lot - from worst in class 23/32 in 2004 to middle-pack 27/35 for the 2011 5-speed. Different engine, slightly taller gearing, aero tweaks. Nothing to write home about for sure. But nothing to sneeze at either.
The next gen Aveo (2012 model in North America, 2011 model year in Europe) is likely to get around 40 mpg (US) highway and will have a 6-speed manual transmission option. In Europe, it will be offered with 2 diesel engine options for the first time. Of course the diesels won't show up on this side of the pond.
I think it's just a matter of time before a new non-hybrid subcompact hatchback ties the Metro's old highway fuel economy rating of 44 mpg (US) (per the 2008 EPA rating).