Ford Grand Marquis Owner's Manual page 239

Extended use of the A/C, defroster, rear
window defroster and other accessories
Underinflated tires
Heavy loads
Aftermarket add-ons such as bike, ski or
luggage racks, bug deflectors, etc.
Self-Service Pointers
If you choose to do your own fueling, you
should also perform a few simple maintenance
routines. This extra effort will save you
additional money and contribute to the driving
efficiency of your vehicle.
The following procedures require only a tire
gauge, a rag, an oil can spout and windshield
washer fluid.
Check the engine oil at every refueling stop
Clean the windshield, outside mirrors and
headlights
Check windshield washer fluid
Check tires for excessive wear or worn edges
Check the tire pressure at least monthly
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