Howdy. I posted a few weeks ago about my 1996 960 getting 15 miles to the gallon, and received numerous responses, which I greatly appreciate. The mileage dropped even further, to 13 on one tank of city driving. I took the 960 to a friend's shop and hooked in his OTC scanner. Fully warmed, temperature input to the computer was approximately 205 F. Since he doesn't have the Volvo card for the scanner we could only read one O2 sensor, I'm assuming the front one. At 2,100 rpm it basically flat-lined, and it showed a terminal lean condition, which would make the computer hold the injectors open longer to richen the mixture. Last Saturday I installed a new front O2 sensor. Mileage jumped, but only to 17 mixed city and highway. I'm planning on seeing if I can connect a hand-held voltmeter to the connector for the rear sensor so I can take a read on it, as well. I'll likely replace it regardless. Finally, I discovered the car has 205/65-15 tires, when it's supposed to be 195/65-15. Would that give enough discrepancy in the odometer to make it appear I'm getting worse mileage than might actually be the case?
Richard