No, this will not improve consumption! On contrary!
Read up a little bit on how cylinder deactivation works before you get crazy ideas
![Smiley](http://nefariousmotorsports.com/forum/Smileys/default/smiley.gif)
If you don't have V engine with adjustable camshaft timing or alternatively some very exotic hardware to manipulate only the valves on selected cylinders you can forget it altogether.