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Road & Track (?) did some extreme hyper-miling to get 100 MPG once, and found that using the starter was killing them with an automatic shot of gasoline. Bump starting was the winner for them. YMMV I don't switch off for a stop of less than a minute or two.
The other issue is the time it takes for oil pressure to get through the system after any re-start. I try to give it a couple of seconds before I use the accelerator.
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