Cadillac 1975 Owner's Manual page 5

IMPORTANT FACTS YOU SHOULD KNOW ABOUT GASOLINE MILEAGE AND HOW TO IMPROVE IT
Excessive Idling
An idling engine uses gasoline, too. If you're faced with more than a few
minutes wait and you're not in traffic, it may be better to "turn off" and start
again later.
Sudden Stops
Sudden stops themselves don't waste gasoline, but energy is wasted as heat
in braking. Energy in the form of gasoline is also needed to accelerate back
to driving speed.
Lubricants
A properly lubricated vehicle means less friction between moving parts.
Consult this manual and the maintenance schedule for the proper lubricants
to use and the lubrication intervals.
Air Cleaner
Your car receives its power from a mixture of gasoline and air. The air is
taken into the system through the air cleaner so it's important to replace
the air cleaner at required intervals. A dirty air cleaner reduces engine
efficiency.
Properly Tuned Engine
Overall tuning (a check on timing, spark plugs, emission control device,
etc.) can improve your car's gas mileage. You just can't expect an "out-of¬
tune" engine to give you good gas mileage and cleaner air.
Excess Weight
Fuel economy is related to the work the engine must do. The heavier the
load, the more power it takes. Keep excess weight to a minimum by
removing any personal effects or luggage from the car or trunk when they
are not needed.
Tire Inflation
Under inflation not only causes needless wear of the tires, but can also
waste gasoline. It's a good idea to check tire pressures regularly.
Wheel Alignment
Incorrect "toe in" or "toe out" has the effect of dragging your front tires
sideways and causes premature tire wear. It takes power to carry this extra
load and that takes gas from your tank.