Ever since I started hypermiling, I always used the stopwatch on my wristwatch to time the ICE-off times of a P&G and a FAS. I consider 15 seconds as the minimum for an OK glide, but I usually have the ICE off for at least half a minute.
Anyways, yesterday I was driving on some local roads, no traffic to speak of, and the road was slightly down-hill almost the whole time. I turned the ICE off when I knew that I would not need to brake for a while, and managed an increadible (for me anyways) eight minutes and forty-five seconds
At an average speed of about 60 km/h (about 40 MPH), top speed of maybe 75 km/h (50 MPH), I 'drove' around nine kilometers (a good five miles). I could have gone further, the only reason I stopped was because I was going by some houses when a cat ran onto the road (I stopped within a couple of yards of him).
So, what have your longest glides been?
1.8 L gas engine, manual transmission Toyota Carina.
Never sold in the States, but very similar to a Corolla.