My S-10 with 4.3L VORTEC glides so bad that engine braking for more than 5 seconds is rare Haha. In my friend's 2010 VW Jetta Sportwagen, you can downshift (auto with manual shifter) and engine brake. When you do, you have to engine brake for about 10 seconds THEN it will cut off and the factory gauge will show "----". When you first start engine braking, it goes down usually to around 30MPG or so before it shows "----".
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