The biggest factor is going to be your driving habits. Slower accelerations and longer smoother stops and highway speeds closer to 55mph than 80+ will make a big difference. Of course highway driving will always be better than stop and go driving. It takes much less fuel to maintain a speed than it does to accelerate to it.
There are a lot of gimmick products out there that are exactly that, gimmicks. The biggest factor and easiest to control is the operator of the vehicle.
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