Fuel Cut On Overrun

[bkloco]

I am lead to believe that most modern fuel inj systems have a fuel cut on overrun algorithm built into the program.
MegaSquirt (as far as I know) doesn't have this facility.
I would like to incorporate this function in the interests of economy.

My thoughts are as follows:

My engine runs with MAP setting from 25 kpa. to 100 kpa and idles around the 30 kpa region.
It only ever dips below 25 Kpa on overrun.
I figure that if I change my bottom row of bins to say 15 Kpa and enter a value of zero into all these bins then that will efectively give me fuel cut on overrun.
Can anyone see any problems with this.
The only one that I can see is that I will be running the map 12 X 11 rather than 12 X 12 due to "wasting" one row of MAP values.
I don't think this will cause undue problems as many ECUs run 8 X 8 anyway.
I think it will simply make my map a little "coarser"
The only other thing that occurs to me is: Do you need fuel on overrun to lubricate the bores?
I figure that if you have no fuel injected then the engine is simply acting as an air pump.
Constructive comments please.

[PSIG]

You could do that. Or the feature is available here:http://megasquirt.sourceforge.net/extra/overrun.html

You do not want raw fuel in the cylinder as it washes the oil off the walls.

[bkloco]

Thanks for that but I'm running MS II and as I understand it fuel cut is not available for the MS II code.
Sorry I should have said.

[keithmac]

I tried it with the VE table, problem is it may make gearchanges harsh as the engine will slow down rapidly while shifting. It`s better to have it timed as well (I use 2 seconds before cuttind fuel to avoid the gearchange problems).