Good job with the t-stat, Tony. Where is your temp gauge needle now? I'm pretty sure that your '98 should ride just shy of the 1/2 mark, like mine. Chances are that you could have bumped your temp up with the a new stat and bump it even higher by grinding the pin more. FWIW when I replaced my stat many years ago I didn't notice any difference in mileage...I was keeping track of my mileage but I wasn't trying to hypermile either...
I'm running high 30s so far this winter...
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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