Ive not read all of this so it may of already been said, but gas is a lubricant. You know that right?

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LOST KJ'S
Where are you going???
Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
-Air Ride Rear Suspension ; OME/Rustys Lift ; Powertrax Locker ; Moog Lower Ball-Joints ; 245/70/16 Yokohama Geolander A/T-S's on MOABS ; Flowmaster 50 SUV
Lost #007082
http://www.cardomain.com/id/jeepjeepster

?
What?
you want to use your engine to fill your tires? please dont try this, the term im guessing you got the idea from was "air pump" from above? this was used to describe what the engine would be doing not what it can be changed to. It would never give you enough pressure to do this... just a bad idea.

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'64 Warrior Rail
1600 DP
Duel Webber 34 ICT
Centerline rims 135/15 and 31x12's
"Do it in the Dirt"

The problem with just unplugging injectors and cutting out the spark is still going to be that it is not going to run correctly period. there is a firing order that has to be maintained and without the ability to alter it you are not going to be able to get the engine to run smoothly... thus never being able to gain the fuel economy without the severe loss of power. My suggestion (and this is just me) would be to deal with the fact that the liberty sucks gas like it was born in 1972 and just wait until jeep offers a liberty with mds. lol if you really want a 4x4 that gets good mileage, buy a samurai.

I do have to give you kudos for putting the thought into it though. I'm all about promoting intelligent thought. keep up the good work.