My driving is mostly stop and go in the city. If traffic is really bad, I have alternate routes. For the most part I maintain a steady speed just above the transmission shift point, either 30 mph or 42 mph. And I coast to lights, unless I have too much speed, then I use DFCO (on an automatic...) I don't get phenomenal mileage, but I never shut the engine off while rolling because I need my steering and brakes. I also coast down most hills.
My best mileage is on highway trips through the mountains (best 52 mpg), my worst mileage is on flat highway trips where I have to maintain 65 or 70 mph to avoid getting run over by the speed demons, about 40 mpg.
In the city on my commute I get 45-46 mpg.
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I'm not coasting, I'm shifting slowly.
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