Ive been a lurker on this forum for about a week. Done a TON of reading. Just purchsed an '07 Tacoma 2.7 5-speed on 10/11/07. Have less than 300 miles on it.
I just purchased a ScanGauge II. I plan on doing some serious mileage testing on this vehicle. I plan to exceed 30 mpg highway.
For the first 5000 (break-in) miles I'm running it bare bones stock with the SGII logging info. Oil change will include Mobile 1 synthetic
For the second 2500 miles I'm going to remove the charcoal filter and log the mileage gain/loss.
Finally, at the 10,000 mile mark, I'm going to treat the engine/tranny/rear-differential with 32 oz. Microlon C-100 aircraft engine treatment. Engine should be broke-in sufficiently at this point.
Engine break-in will consist of highway cruise @ 70-75 mph with 50/50 4th gear...and 5th gears selected. This should allow for 1000+ rpm range of break-in (Toyota says not to remain at one speed/rpm over long distances).
I do a lot of highway driving so mileage should be fairly accurate. I also had a '95 LT-1 Z28 automatic that got 25 mpg @ 75 mph pretty often. This vehicle was all stock. Highest mileage was 27.2.
Wish me luck.