Yes, but only at lower RPM when the turbo isn't spooled. How much more consumption in MPG, I couldn't tell you, but I can't imagine that it'll be more than a few if you have a lead foot.

__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior