I EOC in my van, so does orange4boy. Neither of us have seen any problems, and I go much further than he claims to.
In fact, I've gone up to 3 miles at 60 MPH in neutral w/ the engine off.
When you're at speed, you can put the transmission in neutral, but every time I tried something like that, I didn't really find any gains, because the same places that I put the engine in neutral are the places I'd normally be letting off the accelerator anyway, which meant that in most cases, the engine was basically at high idle, not loaded, so fuel savings were nil.
EOC, I like to think I'm seeing an increase, but I'm coasting down more than a few MPH before starting the engine, as well. I don't do too much driving where I'm going less than 45MPH, so my gains are limited by speed and aerodynamics. In town, you can coast alot further per MPH lost on average, so you may see larger gains than I would.
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