More thoughts on K2500 fuel economy

The thinking is that contributing factors to the K2500’s bad (though getting better) fuel economy could be worn-out injectors (about $50 each from Rock Auto, or $70 from AutoZone). It could also be a bad O2 sensor. Since I’ve replaced the fuel pump, throttle position sensor, MAP sensor, and ignition module, these are the remaining likelies. I suppose, also, I could stand to replace the spark plugs, wires, rotor, and distributor cap, though honestly I’ve never seen performance improve as a result of replacing these so-called tune-up items.