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P&G primarily helps when your vehicle's engine can provide much more power than is needed to push your car down the road. The pulse operates the engine at peak thermal efficiency, and the glide minimizes fuel usage when the power isn't needed. If you're already cruising at close to peak efficiency, then the results are much less. Also, at lower speeds you'll find P&G is more effective at increasing your fuel economy because the lower speed doesn't require as much power, thus your engine is oversized for that speed.
With your quite un-aerodynamic car and smaller engine, I bet you won't see huge gains from going to P&G. The only way to know for sure is to A-B-A test it. That should give you an idea of how much P&G is good for.
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