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Welcome back J,
Man it's hard to get good mileage on hills. My daily average goes down when I'm doing a long drive in the hills of Pa. I drove to Altoona my SGII daily ave. was 43.4. When I drive on more level terrain, to Cleveland, my SGII average was 46.1. So that difference you are experiencing 32 as opposed to 35 could be just that!
My only mods are Synthetic oil, cheap wally world brand, & aired up tires to 50 psi.
Good luck w/ your Matrix!
Dave
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