Once your vehicle receives new spark plugs, you'll notice how much better your car feels while driving. ... Increased Fuel Economy – Misfiring spark plugs can reduce fuel efficiency by as much as 30%. New plugs that are replaced at regular intervals maximize fuel economy, saving you money.

Do spark plugs increase horsepower?

In short, yes, in some situations spark plugs can increase horsepower. ... These 'massive' gains of one or two per cent generally won't be exceeded, even if you're replacing really old and worn spark plugs for new ones. In this case, your essentially just restoring your car back to its peak performance.

Can spark plugs improve performance?

The short answer is Yes, when you replace the spark plugs and wires can increase your vehicle's performance. New spark plugs help keep your engine at its peak performance and efficiency levels. ... Worn or dirty spark plugs require higher voltage to get a strong enough spark to start a vehicle.