The only time I've seen a obvious ecomodder in my area is when I got tailgated (not badly) by a dude in a Honda who was
obviously drafting. Otherwise alone on a four-lane stretch of road, I pulled asside quickly and let him past, then tucked in behind and drafted
him.
My best tailgater ditch was when I didn't slow down for a speed hump in a Nissan Patrol with 3" lift. About 50-60kph the suspension absorbs a speedhump like it isn't there, no need to slow down. I had an overloaded looking car full of teenagers (possibly drinking) following me way too close so I just barrelled over a speed hump at the area's speed limit of 50.
That woulda broken something for sure