Recently filled up my tank to full after a drill weekend, was at about 1/4 or less after only five days of driving. Normally I can make it 1.5-2 weeks on one tank of gas. What could cause increased consumption, I have been driving about the same? I have in the past few months installed new spark plugs, rotor, cap, vacuum lines, ignition wires, Bosch O2 sensor, DME temp sensor, etc.. Could poor quality gas affect the consumption? Mostly use ARCO these days, but I did go to a no name place recently, I think.