OK....not really a problem, but it's got me wondering. :-)
2002 Tacoma, 22k miles. In the first year, took a dozen trips on the same highway, with same gas, same amount of cargo (basically, nothing but me and a suitcase), and always got 290-300 miles per tank of gas. No stop & go, all 55-65 mph. This past month, took the same trip 3 times and got 330-350 miles per tank. Same cargo, same tire inflation, same brand & grade of gas, same oil. I had a different brand of granola bars with me, and 3 new Led Zeppelin CDs which weren't with me during the first year, but I'm not aware of any possible connections with these objects.Can something change as a vehicle ages, to produce this result?