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Yeah, Mobil 1 in the engine always. I dont use synthetic in the transmission on purpose though. Synthetic in my transmission wont let the syncros speed up fast enough. So I use the factory recommended Mercon 5.
And ive always wanted to see back to back testing on the gear change thing. While it may benefit a vehicle on the highway I would think it would hurt MPGs more in city. You'll have to push the pedal harder to get it to move because the RPMs are lower. And most engines make less horsepower the lower you go in the RPM band. And by needing to use more power to get going it might hurt a car in stop and go traffic. I do jump gears sometimes though. 1-3-4-5 or 1-2-4-5.
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