I have a very perplexing dilemna. I had just managed to finally get my car to give me 37 mpg. However, the next tank, the first 1/2 of tank seemed to do very well, but the second 1/2 seemed horrible. The tank I just finished was profoundly, substantially worse. This tank was down under 30 mpg.
I am not getting a CEL indicating any problem of any kind. Does anybody have any suggestions or thought's on what I might check? I have a VM monitoring the Oxygen sensor, and the sensor seems to be functioning exactly as it should.
Does anyone know if California just switched over to winter fuel blend? Is this sort of a drop even remotely reasonable, for a switch from summer to winter? I am thouroghly puzzeled!
Thanks, Gary Palmer