I'm not a car knowledgeable person and could possibly be over thinking this. I put premium in my car. I've gotten my car to a consistent 26 to 28 mpg. I don't know when my mpg went down but I looked yesterday on my car and it's down to 18mpg. I haven't changed my driving habits. Any other ideas then me jumping to the conclusion the quality of gas has decreased?
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If you have changed battery or reset the panel it starts at 0 mpg and takes few days/weeks to build back up to a more accurate average depending on driving habits and road conditions
Hmmm. I did just change my battery but that was 4 weeks ago.
I couldn't tell you how many miles it takes to get back to the true average I say few days/weeks on my truck but I put alot of miles on it each day, look at it over few days if it is climbing back up I'd say it's slow to reset to that sweet mpg it shows after a few tanks run through it