[Fat Charlie]

Main conclusions:
-Their testing showed EOC got 5% to 10% less fuel consumption than constant speed on cruise.
-Any coasting (even with the engine on) helps.
-In testing and simulations, coasting consistently helped.
-Maximizing the time spent coasting maximizes its benefis.
-Smaller glide downs get smaller results.
-This was an engineering study. The real benefits of coasting depend on the driver's willingness to gain them.
-YMMV. This study only tested one car on one route, but the general tendencies shown in the work will prevail.

Fun highlights:

The fourth paragraph of the report opens (cleaned up a bit):
It is basic knowledge, that an integration of coasting phases can reduce the fuel consumption of a motor vehicle over driven distance... In the US the general public knows such activities as "pulse&glide" or "hypermiling".

Accelerating under high load is good for FE.
For low engine loads, the increased time to regain speed entails a significant reduction in coasting duration and less fuel savings due to higher integral ‘friction’ losses for higher mean engine rpm.

DWB FTW!
Additionally all drives with significant use of the brake were omitted since the dissipated energy cannot be quantified and the vehicle is not hybridized. Braking can be completely avoided in surprisingly many drives by decent anticipation, even in German workday’s daytime situations.