Jerry,

I remember back around 1974 my Dad bought a fuel economy gauge. It had a hose and a T fitting for you to spice into a vacuum line that came off the manifold. He put it on his 72 F250 with a 360 in it. The fuel mileage was better when he drove it, but my brother and I couldnÆt keep our foot off that skinny pedal. But as long as you could keep the vacuum in the green section on the gauge, it did get a lot better fuel economy.

Now I havenÆt seen it, but a friend of mine with a Prius tells me his has a economy gauge, and if you he doesnÆt pay attention to his driving, he can get mileage as low as 22 mpg. But he has also had as much as 58 mpg. He recently went from St Louis to Northeast Florida , round trip cost him 150 dollars. Now I doubt the Prius has a vacuum gauge, but the moral of the story, if there is one here, is that driving habits can do a lot to your gas mileage, even when you have the greenest car around .