I have a vw fox and I am trying to increase my fuel economy. I have made a half grill cardboard insert. I use to just travel at 55 mph on the freeway. But with this last tank I am experimenting with pulse and gliding between 60 and 50. Also I do a lot of fas and my car does not come with power steering. I am thinking about installing a vacuum pump for the brake booster. And creating an ignition button that only cuts the spark so my lights don't flash from keying off. Any other suggestions?