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I agree with Arminius. Use pulse and glide, but use engine on coasting if your uncomfortable with engine off (although once you're used to it its invaluable, even for freeway driving IMO). That alone should bring you pretty close to 40 I would think. I've heard reports of xBs getting mid 40s with the combination of a few other techniques and no mods.
I would disagree that the grill block will do nothing for you in summer. Its still an aerodynamic modification and at freeway speeds its even more important. Also, do not accelerate slowly. Thats a good starting technique, but if you want more mileage you'll have to change that. Use a lot of throttle (1/2 to 3/4 normally) and shift so you keep rpms under 3000. This is generally the most efficient acceleration.
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