In 2008 the New Oxford American Dictionary chose "hypermiler" as best new word of the year. That's a big deal in dictionary circles, I guess.
I've never been a hypermiler, but I've always been a miles per gallon kinda guy. My favorite vehicle that I ever had was a 1978 Chevy Monza (like a Pontiac Sunbird) with a 4 cylinder engine and a 5 speed manual shift transmission, and it had an 18½ gallon tank. I used to get over 50 MPG with that thing. It wasn't much fun driving it for the year and a half that I live in Pittsburgh (having to shift in all those mountains) and I only got about 30 MPG while living there, but after I moved back to western KY it was a joy to drive. 35 MPG or more in town and 50 or more on the highway.
My next car was a candy apple red 1984 Chevy Camaro. It didn't get as good a fuel mileage, but it did get me a lot of tickets.
Tip: Never buy a red sportscar. Buy any color but red.
But it did teach me ways to conserve fuel and get better mileage. I started out getting about 17 MPG with that thing, but after employing a few things that hypermilers use, mostly common sense stuff now, I pushed it up towards 25 MPG overall. Had that car for 10 years. Then I got a soccer mommy Caravan, and life's been downhill ever since.
I've never drafted a big truck, tho. When I get just about as close as I wanna be, which is still too close, I'm in the middle of their wake and get buffeted like crazy. You've got to get in front of that wake, and that's way too close. I'll do long distance drafting, where I'll to about 5 MPH slower than the ones passing me, and they'll kind of pull me right along. Works best on straight and flat, like across the Ohio Turnpike. I can get just silly fuel mileagle that way. 28, even 30 MPG across the Turnpike.