Hows your driving style? The more open the throttle, the more gas you use.

Not necessarily true. There is a check valve in the fuel pump that should prevent the pressure from bleeding down but I have heard from people much more knowledgable than I that the GM fuel systems are known for not holding pressure. A leaky check valve would leak down into the tank. I have to agree, jr'* method is easier. All I am saying is if you find a pressure drop with that method, don't assume it is an injector or FPR. It could be a check valve, which is not big deal Might just take an extra crank or two to get it started. .

Wow, that is really bad. I put on about 300 miles a week. Very little of that is ever over 55mph. It is about equal mix between 15 mile highway a day and lots of town driving. I still manage 18-20. My driving style is VERY inefficient though I must admit. I think I'm addicted to adrenaline!

Of course, the exhaust probably helped my car, so not quite sure what to tell you. I did however have a 1992 non */C Bonneville SSE for about two months. I drove this around and was getting 23 mpg with mixed highway and lots of city. I was amazed! I think you should be getting better mileage.

How 'bout the Torque Convertor Clutch? Is it Locking Up after 45mph?