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Welcome to the site ISV-2K8Rondo! Congrats on the better mileage.
1) Your acceleration is probably fine. To be honest, acceleration rate doesn't have a huge effect on fuel economy from my experience. Accelerating or not having to accelerate is a MUCH larger factor.
2) I would recommend pumping up the tires a bit more. Start with 40. If that works and you're comfortable with a little more go for it. Pay attention to the change in handling so you know how its changed.
3) Its probably not too hard to remove the cross bars of the rack. That will be your biggest gain. The rails you might have a lot more work into and they won't do as much.
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