Air filter prevents dust particle entering the cumbustion chamber,however it restrict the passage of air, adding air filter will not increase the mileage in general, regular cleaning/replacement is necessary to prevent increase in restriction of air passage through it.
Depending on the mileage, and if you are having issues, your best option would be to change the transmission fluid/filter. I would not recommend additives or flushing.
add water or filter it
Yes, they make performance chips for a F150. They will add performance and increase you gas mileage to get the most out of your engine.
Fuel additives are used to improve an automobile's environmental performance and increase its mileage. Some homemade fuel additives are ethanol and a mixture of acetone, xylene and cycle oil.
It will be an antique in 3 years and if it's in good shape, it will increase in value. Low mileage, extra options add to the value. If roadworthy with normal wear, no extras; a dealer will ask about $1000.
Keep it tuned, add an aftermarket air filter such as K&N, change the rear diff gear ratio,
In normal everyday driving it will add no extra horsepower. In a racing situation at high rpms it will add some but not much. How much depends on the engine that it is installed on.
Usually around 2 qts . with filter . change filter add a qt and a half start engine to fill filter and then check oil to see if you need to add more.
Changing spark plugs, air filter, fuel filter, cabin filter, engine oil & oil filter, aprox $325. Add aprox $150 for a valve adjustment. Add aprox $175 for automatic transmission fluid and filter change. Add aprox $80 for coolant flush and replacement.
It is much better for the ifsh if you add a pump or filter in your tank.
If you add tooo much salt yes
its according to the mileage of the vehicle. Add you vehicles name and manufacturer and then, i will say the cost