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Get a bottle of redline fuel treatment. Also your issues could simply be from a bad 12v battery, or a lose wheel-hub / speed-sensor...
I use a bottle of fuel system cleaner in my Prius once a year maybe, but I also only use top tier gas stations. It could explain why on...
The mpg indicator on the dash will have higher mpgs.
I've done fuel treatments during the winter with good results. I understand where you come from though, there are plenty of people who...