Yeah, those tires were certainly no good for MPG. You were running about 800 RPM higher at 60 than you should be. This car should do almost exactly 3000 RPM at 60MPH. So, one bright spot is that you actually have less miles on it that what the odo says, providing the typical odo gear failure has either not happened yet or has been fixed.

As far as clicking/clunking sounds, go take a good look at your exhaust pipe for cylinders 1-3. This pipe likes to bottom out on either the idler arm or the cross member. This can cause intermittent tapping/clunking/chattering sounds.

You don't want to damage your motor, so you really do want to do a oil pressure test before you do much of anything else. If you are indeed getting low oil pressure, you will obviously want to fix that before addressing other issues.

What weight oil are you running?


-tp