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Subscribe to this threadGeneva 2008: Bentley's future involves drawing straw
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Mulad @ Mar 5th 2008 4:11PM
A CVT is theoretically more efficient because it can keep the engine at an rpm level that is most effective for the type of driving being experienced. However, CVTs also have more internal losses than a normal geared transmission. In reality, most CVTs have still turned out to be less efficient than manual gearboxes, though a handful have done better than that in EPA tests.
Roughly the same can be said for wet-clutch DSGs. In the real world, a DSG car tends to get slightly lower fuel economy than a manual, though EPA tests have said slightly the opposite. Both CVTs and DSGs have smoother shifting than either traditional automatics or manuals, so it's a reasonable compromise. I haven't seen if newer dry-clutch DSGs actually outperform in terms of fuel economy in the real world yet.
I believe it's generally still the case that a manual is still better than a DSG, which is better than a CVT, which is better than a slushbox auto.