Thanks for your reply Stan. You just may be right. My TCH is still running great seven days after getting it back from the dealer. And the battery really is holding a charge longer than before. I'm just glad my car is back and running good. The dealer drove it hard and got the mpg down - it was under 500 miles per tank when I got it back, but on my current tank I'm average 36.2mpg right now.

I'm bummed as I've kept every gas station receipt from all the fillups which included mileage, but the dealer filled the tank twice and messed up my records! I'll just start over from now.