Spark plugs and Practice

I've bumped up my MPG average from 27 (see my last post) to 31! I haven't installed any major devices in my car or anything to get my 2001 SUV (non hybrid) going 33% more efficient than factory tests. I have installed some new spark plugs and continued to improve on my driving habits which has done the trick. I've learned to turn off my car when ever i am coasting and idling. If your car is stopped for more than 10 seconds you would be wasting gas by leaving the engine on. I took that a step further and turned off my SUV whenever i was coasting for more than 10 seconds. I've discovered some places where i have been coasting for over a mile! It's great to be enjoying mileage better than most cars. Here is the most fuel efficient gas saving spark plugs on the market today that now have made a nice warm home in my engine. The E3 spark plugs are a little more expensive, but for what they have saved me, they have paid for themselves within the first couple of fill ups.