in trouble. Have you ever noticed how the price of gas seems to go through a vicious cycle where it will go up really high, then drop down a bit (but never quite as low as it used to be), before going back up again? While there isn't a whole lot that we can do that would affect the overall cost of gas (except for not buying it that is) there are a few things that you can do that will help you reduce the number of times you have to refill your tank. The best way is by learning some better driving habits for better gas mileage. You would be amazed at just how quickly these savings will add up.
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You can improve gas mileage by driving so as to maximize average engine vacuum. Since few vehicles have vacuum gauges installed, the way you do this is to use less throttle when driving slow, more when driving fast (seems obvious, doesn't it?).
However, on hills, you achieve this by slowly reducing throttle uphill, losing speed when you do so. You continue to reduce throttle as you lose speed (but not so much you can't have some reasonable speed over the crest of the hill. You reverse this by slowly increasing throttle (and gaining speed) down hill (but watch the speed so it's never "too" fast).
The problem is that, in the extreme, you would be going very slow across the crest of hills and very fast in the valleys at the bottoms. So, the big trick is to learn how to look ahead and apply a reasonable amount of this approach when the roads, traffic, etc., make it feasible.
As a practical example, on a lightly traveled limited access highway, you might want to give up 10-15 mph going up a hill and gaining it back coming down. Just do what's safe and not likely to get you a violation!