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Pick up a real temp gauge, then you'll know for sure. A head gasket isn't hard to do, but if you do warp the head then you're into machine costs and all that jazz that is going to far and away negate any fuel savings. I wouldn't trust the stock gauges in almost anything, especially after seeing how my girlfriend's '92 Metro's cluster is (just as an example, the fuel gauge will bottom out before she needs to fill up, the one in my truck is the same way, I'll be on the bottom line of the empty reading and still have 5 gallons in the tank, at my current mpg, that's another 80 miles of driving)
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