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02-11-2007, 10:46 PM
I have an 2005 XJR which has averaged 20.5 MPG since I bought it in Jan 05. But for the past 3 months the average gas mileage has dropped by nearly 2MPG to 18.8 MPG. My average speed of 30-35 mph is mostly highway. I had two wheels that were bent which have been repaired but that made absolutely no difference. A 20K mile service in January had no positive effect nor were any problems found. The very cold weather has usually subtracted only a .5 mpg difference in the past.

Does anybody have any ideas what's happening?

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