DifferentPointofView -
They are also a two-for-one. People use them to determine engine health :
Here's one that looks like it's from the 1970's fuel crunch, because it's labeled for MPG :
MILEAGE MONITOR
http://ideamaster.com/mm.htm
Quote:
The Mileage Monitor is a precision engineered vacuum gage. The instrument itself has no effect on performance or mileage, but if you use the Mileage Monitor as a driving guide, you can achieve a substantial improvement in your gas mileage.
If you don't want to install the Mileage Monitor in your vehicle, you can just use it as tool to tune up your engine, for the best mileage.
The highest reading indicates the best gas mileage. Normally, driving at a slower speed will get you more miles per gallon, but sometimes increasing your speed a bit will also increase your gas mileage. Just glance at the gage from time to time to see for yourself.
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I have the $14.99 Garage-Pro 2" gauge from JCWhitney, but I haven't installed it. My Todo list is laughing at me
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CarloSW2