My o2 sensors were bad, and the check engine light was on, replaced both upstream o2s and cleared the codes. Immediately noticed an improvement in mpg over the next week or two just driving back and forth to work. I have read things about o2 sensors becoming “lazy” as they get older. Could be...
Just returned from a trip to Colorado, from Central Texas. 14 hours each way and mostly all highway there and back. Averaged 14.5 mpg at 75-80 mph but we were driving into a 30 mph north wind(cold front). Coming back, averaging 16.5 mph, not fighting winds and coming down in elevation...
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