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Don't be so sure that the fuel economy will be lower with the wastegate connected. I would expect it to be the same if you don't use turbo boost. When I drove a 1994 Saab 9000 Turbo with automatic transmission, the computer reported that it averaged 43 MPG after driving about 100 miles. I occasionally used neutral when going down hills. There were few stops on this trip, maybe about 8. The 9000 seems to get about 10 MPG more than the Saab 900. The 2.3 liter engine must be very efficient.
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Why wouldn't it do better with the wastegate open? Even under manifold vacuum, I can hear the hissing of pressure building up behind the throttle plate and a subdued "psssshhhhhh" when I let off the throttle. That energy comes from somewhere, no? What about the fact that I can achieve much higher throttle openings without the turbo?