I just bought a used 2005 Highlander, 4WD, V-6 3.3L engine. After filling the tank a couple of times I average about 16mpg. It's rating is 18 city 24 hwy, so that's pretty low. Since it's hot the A/C has been on, would that decrease it so much? I should note that the previous owner seemed to keep up with oil changes during the 9 months she owned the vehicle: oil was changed at 5700 miles and again at 11,100 miles according to the two invoices I found in the glovebox. So I don't think the low mpg is a maintenance issue.
Driving is mixed, the usual surburbia-type driving, with speeds raning up to
50 miles per hour. No extended highway driving for comparison yet.Any ideas, or am I getting a "normal" mpg for this type vehicle? I would have expected a little closer to 20 mpg.