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OK, before things get out of control here
I for one am an advocate of replacing a plugged up cat with a free-er flowing model, but it still needs to be "legal" and do what it's made to do - clean the air coming out of the engine (had the same problem myself). Does it really improve FE, I don't really know.
My commute has now changed to half rural, half city driving vice 90% highway and I've still managed to improve mileage by re-teaching my right foot how to make my auto trans work for me.
I should have my scanguage next week, so I'm looking forward to more "foot training" as I learn what exactly my engine is doing.
I definately agree with the vacuum guage option, it kind of gives your right foot a conscience when you're trying to beat the clock getting somewhere.
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