I would be checking what is going into the tank .. do you buy your fuel mainstream or from one of the discounters? .. I ask as these guys tend to be a bit "strange" on fuel quality from experience.
I would be putting 95 or better (not ethanol blended) into the tank and you will find that the extra co$t will be less then the gain in economy.
For the record, I get better then you from my 4l but only on 95 or better.
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There are 4 wheel drives, and there are Jeeps... seems I found out too late in life.
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