At my altitude we lose about one third power, so 100hp. Good thing we don't have freeways.
Speaking of full throttle, the Previa is said to get worse than average fuel mileage due to it's "underpowered" engine. My thought is if I just accelerate at a not-full-throttle load then I should be able to get better fuel mileage regardless of the vehicle.
It's climbing mountain passes that do put that to test though as I've had cars that could barely keep it at 25 or 30mph going up a steep pass that's rated at 45 to 65mph.
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