my 97 Lego has never made good fuel mileage since I have had it. It gets about 25 on the highway. My 98 with the same mileage got 28-29, before it was totalled.

 

Yesterday, with the heads pulled, I can see a fair amount of carbon build up on the pistons and chambers. By fair amount, I mean more than any other I have ever seen on a 100K plus mile 2.2

 

Never had a check engine lights. compressions were always good 190 or better, kept in tune with Denso plugs, wires etc...

 

All the cylinders look the same, so I am wondering if fuel pressure regulator could be the cause, or maybe egr.

 

Anyone have a good idea?

my 90 leggy with 2.2 gets about 25. 26 on a good day. bad FPR would probobly make your mileage more like 17-18. more likely that a few mpgs could be attributed to sensors fatiguing, like lazy O2 sensor or dirty maf, or even a "dead" spot in the tps at cruising position (my gl did that).