Quote Originally Posted by sidney
Hey

Thanks for your reply. The car is an automatic and all of the driving has been in the city with the A/C on. However, I drive quite sedately and Birmingham has a lot of interstates and parkway roads running through it so it's not start and stop running. I will change the oil to Mobil 1 shortly, as I have it in all my cars and bikes. That might give the mileage a bit of a boost but surely not a 6-8 mpg improvement. My 3 liter Ford mini-van does 23 mpg, even heavily loaded.
Read this thread to learn why your mileage will be poor at speeds below 45 MPH: viewtopic.php?f=49&t=27350&start=45