You should look into installing a vacuum guage like I did. About $15 and I can fine tune my highway driving to easily get over an extra mpg. Pretty soon I'm going to do some experiments with the converter lock points by comparing to the guage. But even without it I get about 13.8 city and ~20 highway mpg. I've been seeing 20 mpg on country roads I used to see 18. The best part was that there was no drilling besides the installation of the guage.
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