Quote:
Originally Posted by Lizey93
For the first 3 months I had my car I only ran 87 in it and averaged 25.1 across that entire timeframe with about 75/25 highway. For the last 7 or 8 tanks I have been using 89 and I am averaging 22.5 with the same drive. I am switching back to 87 when I fill up tonight to see if it goes back up.
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Just an FYI. Part of the reason for decrease in mileage during the past 7 or 8 tanks is because the weather changed on you. The warmer it is the better the fuel economy, that is due to the fact the air is more dense. The denser the air, the less fuel required. Thus better MPG. I have 7 years worth of data to show my mileage for over 100K miles.
Below is just one of my charts.