hi sages- mpg is always a good barometer of engine condition if you first establish a pattern or baseline for your particular vehicle. have run a 92 245 for 5 years now, mostly around town suburban driving. a few years ago replaced plugs, rotor, cap ,air filterand wires. mpg went up to 24 around town and 29-30 on hwy and has stayed there since. non functioning ac.believe a big factor is the 245 has the m47 5 spd with 3 floor pedals. a few folks here have the wagon like me but have the automatic trans. all get lower mpg in the 18-23 range. have had the same experience for many years with fords and dodges. keep up the good work. thanks tons oldduke