Fuel additives that claim to boost your vehicle’s fuel mileage actually could be adding to the cost of driving, according to AAA Arizona. Although some additives are effective in cleaning fuel injectors or removing moisture from fuel, none of the additives evaluated by AAA has ever achieved significant fuel-mileage gains, said John Nielsen, director of AAA’s Approved Auto Repair Network. AAA advises that motorists can get the most out of each $3 gallon of Fuel by maintaining tire pressures, keeping vehicles tuned up and driving at slow, steady speeds News source: AZ Central