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re:
May I suggest drafting big trucks!!!! Obviously, be safe about it, and I don't want a nasty email when a rock cracks your windshield, BUT......
I have been doing this for the last few days and have seen big improvements. I use the digital mpg display to determine the difference -- I don't have a scanguage -- and there appears to be a 3-4 mpg increase (24 to 28 or so) when I cruise behind a big truck at 55mph, as opposed to having no one in front of me. This is based on limited experience (so far), but there is a very noticeable difference, at the very least. More info to follow, once I collect some more data.
FYI: I have an '07 Tundra, which is about as aerodynamic as, well, something that's not aerodynamic at all. I think the drafting technique helps us boxy truck guys far more than it helps the little 40+ mpg folk.
Good luck with the Tahoe.
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