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My wife has a DSG 6sd golf. Around town it does fairly well at dropping to idle and coasting off throttle. On the highway I find it better to manually shift to 6th and leave it there because in auto it down shifts to 5th with too little pressure on the accelerator. With that said the best I've managed is about 34 mpg on longer trips. My wife gets about 24 in town.
The computer does try to shut off the injectors when coasting but that causes a noticeable deceleration. Shifting to neutral is NOT recommended because of cooling and lubrication issues. Stick to true manuals if you want to neutral coast.
FYI my biggest complaint with the VW DSG, is the shifter is setup backwards. ie, bump the lever forward to increase gear, and back to decrease.
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