i got a 92 wit a 4.0 3in lift and 31s and it only gets about 10 mpg i used to get about 15 to 18 and for some reason it gets up to about 210 nd then falls down to about 160 and stays there i assume the 2 are related but i dont kno what to do about it. i put in the right thermostat, its got a new radiator and a new collant temp sensor. nd still have no clue whats goin on. any ideas?

 

I stick a piece of cardboard in front of part of the radiator to keep it at running temp when its really cold out. The bad economy is probably due to the low temp, since the computer will richen it up when its cold.

 

that was my first guess but im from near st. louis mo. and it gets up to 50 outside and i still run cold