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what kind of mpg? 760 turbo wagon 700

Normal range is 26 to 27 highway, 17 to 19 city. Those highway numbers were at 65 mph with cruise and AC. At 70 to 75 mph you should get around 23 to 24 mpg.
Could be several factors affecting your mileage, yes O2 sensor going bad can cause a drop in mileage. Also check tire pressure and make sure air and fuel filters are clean and not clogged. Look for a vacumm leak it also cause a increase in fuel useage. Also using less than 91 octane will also decrease you fuel mileage. When was the last time you tuned it up and check the AMM's settings as well as the timing? Is the transmision slipping at the higher speeds? You should be running 3000 rpms at 80 mph. Sorry about all the info but usually it's not just one factor but many when our cars get up there in miles.






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