Those are pretty big gains! What are those things you are putting in your engine and diffs? Currently I use 10w-30 full synthetic and 70w-90 synthetic gear oil.
My Jeep is a lot more efficient now that I replaced the battery and alternator. I drive mostly highway (~65 mpg or about 105 kmh) and I average 22 mpg. I'm very happy with this but I think I can do better. Most of my sensors are original, so I think replacing them might slightly improve my numbers.
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