If they are dirty, yes.
you can get upto 100,000 miles on a set of plugs
Only if there's something wrong with your old spark plugs.
First air cleaner, second spark plugs/tune up, and even worn tires.
Yes.Yes.
100K
Change the plugs and plug wires at around 100,000 miles or earlier if you detect a miss or loss in performance of mileage.
Changing your spark plugs could theoretically make your car faster but not enough to make a noticeable difference. Changing your spark plugs when they are worn will increase your fuel mileage slightly.
change the spark plugs and wires and change the oil and change the oil filter and air cleaner filter and you should get better gas miles
Change the oil, oil filter, spark plugs, spark plug wires, air filter, and I would run some injection cleaner through it.
EVERY 60K
the engine is constantly vibrating and it dislodges the spark plugs
Every 100 000km