please help. no idea

[BlackYJ]

The 195 sounds right

[Bnine]

Its either what clay said about the computer finally recognizing no post 02 and cat,  or its a bad temp sensor. Either one will leave your rig in open loop and cause really rich starts, and poor running.

Otherwise, only thing left is a bad injector. If you have an injector that is bleeding, it will act the same way. Pull the rail and see if an injector is leaking.

[BUKI]

im starting to get lots more mileage now.  im already at 142kms and still half a tank.  thanx for everyone's  help.  the quest for mileage is sooo expensive.

[Bnine]

im starting to get lots more mileage now.  im already at 142kms and still half a tank.  thanx for everyone's  help.  the quest for mileage is sooo expensive.

Sounds like during the stat change, you may have inadvertantly fixed up the temp sensor. A warmer stat really wont make a significant different, although it will make a really small one due to operating at the proper temp/efficiency.

If your problem comes back, look to that sensor, or possible the pigtail for a cracked wire.