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Over the past few days I traveled 67 miles around town and made a 100 mile road trip. The combined 167 mileage gave me 25.21 MPG which is very encouraging. Perhaps the under-drive pulleys are worth the trouble after all. The short road trip probably was not the best way to test a change.
Of interest was with the much more quiet under-hood noises, I was able to diagnose a bad idler pulley bearing. It was replaced during the 167 mile stretch of time but I doubt it was a significant influence on the mileage. I suspect the tensioner arm pulley bearing is in bad shape as well. Will be replacing it in the next few days.
The Scanguage arrived yesterday and was installed today. Things should get more interesting real soon.
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