Next-gen GM 6-speed automatic to boost mileage another 5 percent
The new version will have updated electronic control strategies based on the work done for the new Equinox four cylinder. The Equinox managed a 32 mpg highway rating. The new controls will contribute three percent of the improvement for 2012 models like the Cruze.
Another two percent improvement will come from refinements to the guts of the transmission. Changes to the hydraulic valve body, friction plates and variable flow solenoid will cut internal pumping losses and friction.
GM is also working on its own in-house developed dual clutch transmissions. GMPT is developing a dry clutch system which should yield another incremental improvement in efficiency but no announcement was forthcoming about timing.
[Source: General Motors]
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