My 1997 LEGACY 2.2 liter needs a lot more fuel than usual.

[frankylac]

I use to be very happy with my 97 LEGACY with the 2.2liter
engine. Since last fall (about 3 months) my milage per galon increase by
25-30 percent.
I replaced everything I can, such as skarkplugs, air filter, gas filter,
PCV valve, no defect code on computer. Is anybody as an idea of what is
WRONG with my LEGACY ?

 

[mulder]

Could be a bad front 02 sensor, or coolant temperature sensor. Both can
go out of range and cause problems such as poor fuel economy without
setting any codes.

 

[Edward Hayes]

I agree with the O2 sensor being suspect. Are you letting say a young son or
daughter drive it????????????????

 

[johninKY]

Fuel pressure regulator may have a hole in the diaphram.