2-3 mpg! Mine doesn't extend past the sunroof, which I always have propped open so I think my rack doesn't rob anything from mine.
I honestly think it does. Either that or I have some other issues that haven't thrown a code yet. I had a check engine light come on for a second or two the other day but I haven't cleaned my o2 sensors in a while either
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98 3rz 4x4 5spd- Monstalined, 99 Talls, 4.30 E-locker, Extra Lights
In Progress:
Tundra/Rear Disc Brakes w/parking brake
Roof Rack/Rear Ladder
Sliders
1st Gen Rollbar Shelf