I recently purchased a used 2004 Toyota Sequoia 4x4 V8 and is has been averaging about 15.3 mpg for all driving. My wife changed jobs last week and her commute increased to about 28 miles one way with the majority being highway driving. The first tank on the new commute was 17.4 mpg. I'm fairly happy with improvement, but would like to improve it if possible. I know the engine is "easy" on oil so I may consider deviating from the factory recommended 5w-30 and looking at a 0w-30, 0w-20 or 5w-20 product. I currently have Pennzoil Platinum in it, but am open to other off-the-shelf options. Any thoughts? Anyone else have a Sequoia?