My mileage recently jumped-up by over 10%. I'm not complaining.
Six months ago I replaced my cat with a direct-fit aftermarket and my front o2 sensor with a direct-fit Bosch. The reason was my fuel economy and performance were dismal. At once the performance improved and the fuel economy was restored. The model is a na v70 that has 190k miles.
I drive mostly freeway, between 75-80, and averaged about 24.5 mpg. In the last month, and I've monitored several tanks of regular grade fuel, my mileage has averaged nearly 28 mpg. I have not done a thing to the car except for oil changes. I don't ever remember getting fuel economy this good. I wish the whole country had this problem....
What happened?
Should I call car-talk?
Was the car possessed and the demon left? (Can it become repossessed?)
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I'm stuck on Volvo and Volvo's stuck on me....
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