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The O2 sensor was bad
I may not know until I swap the smaller tires back on.
The O2 sensor was bad before I put the larger tires on.
Only after the tires were installed did I put a new O2 sensor on.
I was only getting 30 miles to the gallon before I installed the new sensor.
With the new sensor and tire I average between 40 and 45 miles to the gallon.
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