Does A Cold Air Intake Increase MPG?

How does a cold air intake affect your car's MPG? Will it increase your gas mileage or do the opposite? Here's the ultimate guide.

Cold air intakes are one of those popular aftermarket mods said to significantly boost performance. But what do they do for your MPG? Will it go up or down?

These days, saving fuel is essential. Driving is becoming more and more expensive, and every penny counts.

Are you considering installing a cold air intake to save on your gas bill?

If so, it’s probably not worth your time. Cold air intakes have a small impact on performance and fuel economy, but without any other modifications, it’s minimal.

A cold air intake usually won’t harm your car’s MPG. But it won’t do that much for it, either.

This guide explains what a cold air intake is and how it impacts your MPG.

Table of ContentsShow

What Is A Cold Air Intake?

Cold Air Intake

A cold air intake replaces your car’s regular air intake. It’s usually a simple bolt-off, bolt-on procedure and was first seen as an aftermarket modification in the 1980s.

Cold air intakes simultaneously:

  • Cool the air going into the engine
  • Increase the density of this air – that is, there’s more oxygen in the same amount of space

In reality, reducing the air’s temperature is the same as increasing the density. It’s this density change that makes the real difference.

With more oxygen going into the motor, combustion is more efficient. The air/fuel mixture ignites with more force, creating more power on its downward stroke. This leads to more overall engine horsepower.

(This is the same principle as bellows for a fireplace. Adding extra oxygen increases the flames’ heat. In an automotive application, this equals more power!)

Thus, a cold air intake improves engine performance. At the same time, it can positively impact fuel economy, engine health, and many other things.

Check that a cold air intake is legal. The manufacturer must meet your state’s EPA guidelines. If it doesn’t, you can’t install it on your car!

How Much Does A Cold Air Intake Cost To Install?

Dollars (Price, Cost)

A good quality cold air intake costs around $300 to $400 (+ tax). There’s no point in installing a terrible one, right?

Most kits are relatively simple to attach to your car yourself. If you choose to get it installed by a mechanic, expect to pay up to an hour’s labor on top. That would typically come to between $80 and $100.

All in all, this comes to between $300 and $500.

Again, you’ll need to check environmental, tax, warranty, insurance, and other legal regulations before doing so.

Do Cold Air Intakes Increase MPG?

Fuel Economy Speedometer Measures MPG Efficiency in Car or Vehic

Cold air intakes can increase gas mileage. However, there’s no set amount. You can’t install a cold air intake and expect to magically see a 5 MPG gain.

All engines work differently. They’re all in various states of repair, ages, conditions, etc.

One motor will react completely differently to another with the same cold air intake.

Having said that, cold air intakes do increase engine efficiency. You get more oxygen into your engine than you would otherwise. How much extra oxygen, though, is highly variable.

Again, though, this is minimal. It isn’t something you’d ever notice without computers logging your precise mileage.

Some manufacturers estimate their cold air intakes will give you MPG gains of up to 5 MPG. This seems over-generous. Real-world tests are in order!

Why Will A Cold Air Intake Increase MPG?

Gas Station Worker

The primary benefit is increased performance. No doubt. However, improved MPG is a minor secondary advantage.

Why?

Well, think of it from this point of view. With better performance, an engine can work less hard to achieve the same power output.

This means that you don’t need to drive so aggressively to achieve the same level of performance you had before.

In The Real World, Does A Cold Air Intake Increase Gas Mileage?

Driving an electric car

Theoretically, yes – slightly. But what about in the real world? Can you see real-life MPG increases for these modified cars on the roads?

In reality? It’s unlikely.

Who is most likely to install a cold air intake on their car? What is the part manufacturer’s target audience?

It’s not usually daily drivers – or indeed anyone concerned about fuel economy. No, the target audience is speed kings, boy racers, and car modifiers. Anyone with a big engine who only wants increased performance.

And there we have it. Cold air intakes might increase your gas mileage if you drive at the same speed as you did beforehand.

But almost everyone who wants a cold air intake has a lead foot. They’re interested in performance gains, not MPG.

And thus, the MPG benefits are often completely disregarded.

Driving sensibly could result in improved gas mileage – yes. It’ll be about as marginal as it gets, but there should still be some slight gain.

But will you really drive your modified car slowly? Are you really that type of person?

Doubtful.

Concluding Thoughts

Cold Air Intake In Car

There’s an essential aspect to car modifications that often isn’t portrayed clearly enough to the general public.

Car modifications look good, but alone (with a couple of exceptions) will do almost nothing for your MPG, performance, or engine health.

If you get a cold air intake installed by itself, you’ll hardly notice anything. That’s entirely against everything the manufacturers and enthusiasts will tell you. But it’s true.

However, paired with other performance-enhancing parts and mods, it can all add up. Consider other engine modifications, such as:

  • Remapping
  • Engine rebuild (parts and gasket replacements and carbon cleaning)
  • Replacement exhaust (performance, if you like)
  • New spark plugs and coil packs
  • New fuel injectors
  • Oil and filter change
  • Fuel filter
  • Fuel additives
  • High-quality coolant
  • Etc.

By combining these, you might end up with some significant power/gas mileage increases. It’s then important to ensure your wheels, tires, brakes, and suspension can cope. Consider upgrading these, too.

Overall, does a cold air intake improve gas mileage? Maybe. Slightly. But there are better alternatives from a fuel economy perspective.

If you’re looking for a fuel-saving modification, your best option is a remap or chip. Specialist technicians alter the ECU programming to increase the average MPG. The trade-off is, as always, reduced performance.

Alternatively, trade your car in for something with better stock fuel economy!

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Benjamin Kitchen

Ben is an automotive author from England. With experience in a fast-fit garage, he's an IMI-qualified light vehicle technician. He aims to help drivers worldwide with common automotive problems. You’ll often find him working with his 1.2 Vauxhall Corsa – it may have a tiny engine, but in eight years it's never once let him down!

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