Better gas mileage with EHA off, Why?

[JBoggs]

I disconnected the wiring to the EHA on my 560sl because I was getting a pulse on decel and I was told it was the EHA limiting the gas (if I understood correctly). I was expecting gas mileage to suffer since there is apparently no longer fuel control on decel with no EHA.

Although I haven't "run the numbers" it is apparent to me that after a tankful of gas over a weeks time, the mileage has actually improved slightly, certainly hasn't gotten worse. Plus, the idle has improved slightly and the aforementioned pulse on decel is gone.

Now I'm really confused.

J. Boggs