[ecomodded]

It would be a good idea to use the engine braking instead of the brakes once you are in a High enough rpm to trigger the fuel cut off.
Then put it back in neutral when the rpm's drop too low for fuel cut off.

Below is a tip from the linked article that scangauge owners can do to find their engines rpm fuel cut off.


quote from original article:

I use a Scangauge II for a lot of diagnostics and general tinkering. It's a great tool—but I've learned not to trust the economy or gallons-used function too closely. That's why the Scangauge has a function that allows you to tell it what the engine-idle cutoff is for your particular car to get somewhere closer to the truth.

Read more: Coasting in Neutral or Gear to Save Gas - Coasting and Fuel Economy - Popular Mechanics

edited to add:

I made a error, he said to enter the fuel cut off rpm, not if you could find it. I suspect you can find it by watching the fuel injector duration readout and notice what rpm it cuts out at.