Wow! 23 mpg with an XC! That's pretty good. Now, on long trips I have noticed that my XC can get upwards of 28 mpg. But like Klaus said it's about your terrain. Most of that driving was done on mostly flat ground with the tires pumped to 39 psi. If you haven't already done so, go to stretcher.com for some good tips to follow for gas mileage. You may have done these but I'd sure try 'em all. I'd also suggest to play around with different octane levels too.
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'98 XC '95 855 GLT '83 245 DL (245 for sale! e-mail me if your looking to buy); All over 125k miles
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