'87 4runner on 33's with 4.88's, but figured I'd chime in. I get anywhere between 15 and 20mpg on the interstate (15 going between 80 and 90mph, 20 going between 60 and 65), and usually average about 17 around town depending on how I drive.

'87 4-Runner--DD/wheeler, 4.3 swap coming soon
'89 Supra--E85 powered 2jz NA-T Swap, 533rwhp 497ft-lbs
'89 Festiva, turboed BP swap powered by megasquirt