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What dyno are you using? If you had a dyno capable of road load simulation you could get pretty close to finding the real max speed without taking the vehicle to a runway or something.
Road load dynos apply load to simulate wind resistance, rolling resistance, etc. The load increases according to a quadratic function- a +bx +cx^2 , where x is basically the weight of the vehicle. You would want to use the load coefficients (a, b, and c) from Subaru or Toyota's EPA fuel economy certification applications. Those applications should be released on their website over the next few months.
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