Frequently Asked Questions

The following is a list of 'Frequently Asked Questions' about One Change and our fuel efficiency initiative.

Who is One Change?

One Change is a non-partisan, not-for-profit organization based in Ottawa, Ontario, Canada. One Change is the community based social marketing organization that runs the One Change fuel efficiency initiative. Our mission is to empower people to believe that simple actions matter and to make smart choices that protect the environment. To find out more visit the One Change website.

Who are One Change's fuel efficiency campaign sponsors?

One Change's fuel efficiency initiative receives funding from a variety of organizations including government bodies (municipal, provincial, federal), utilities, and public and private companies. Sponsors provide the financial support that allows us to carry out our important mission of helping people protect the environment and save money through smart choices.

Visit our sponsors page to see who's sponsoring our fuel efficiency campaigns.

How can One Change hand out so many free digital tire gauges?

One Change can hand out so many free digital tire gauges thanks to the generosity of our sponsors, partners and volunteers. Our sponsors provide us with the funding we need to fund daily operations, our partners provide needed materials and support, and our volunteers bring it all together, delivering gauges door to door in their communities.

How do I volunteer with the One Change fuel efficiency campaign?

It's easy to get involved with the One Change fuel efficiency campaign. Simply fill out the volunteer form here to let us know how you'd like to help. We'll get in touch soon. If there isn't a campaign coming to your town in the near future, why not help us kickstart a new campaign?

Why should I check my tire pressure?

By maintaining proper tire pressure, the average person will increase their fuel efficiency by up to 4% - that's two week’s worth of gas! Not only will you save money, but by using less fuel you will be helping to protect the environment by producing fewer greenhouse gas emissions. Maintaining proper tire pressure is also an important safety measure; driving on properly inflated tires creates a smoother ride and gives your greater control over the vehicle.

How often should I check my tire pressure?

We recommend that you check your tire pressure at least once a month to ensure you are always driving on properly inflated tires.

How do I know the correct pressure for my tire?

Tire pressure is measured in pounds per square inch, or PSI. You can find the correct tire pressure for your vehicle in your user’s manual, or on a sticker inside the driver’s side door jamb. Don’t mistake the PSI number on your tire for the optimal pressure for your vehicle. That number is the maximum pressure for the tire and may be much higher than the recommended pressure that is safe for your car. Tire pressure is different for every vehicle, so be sure to check for the recommended pressure for your vehicle to maximize fuel efficiency and safety.

How accurate is the One Change gauge?

It is accurate to within 1%.

How do you turn the gauge on/off?

The gauge turns itself on and off automatically, and resets after a few seconds.

What is the highest/lowest PSI the One Change gauge can read?

The gauge can read between 0-65 PSI.

I have nitrogen in my tires. Do I still need to check my tire pressure? Will the gauge

work the same way?

The gauge will still work and it is still important to check your tire pressure regularly whether you have air or nitrogen in your tires. However, if you have nitrogen filled tires, you will have to visit your dealership or nitrogen supplier to correct your tire pressure if it is too low.

Should I maintain a different tire pressure for winter/summer?

We recommend maintaining the PSI listed in your user’s manual throughout the year. However, when the temperature drops outside, so can the pressure in your tires, so make sure to check more often when it’s cold outside.

Is the battery included/replaceable?

The battery is included and the gauge is ready to use. When the battery does run out you may unscrew the back to replace the battery. Batteries must always be recycled and should never be thrown in the garbage.

It costs money to fill up my tires. Are you working on that issue?

One Change focuses on actions that individuals can take. Though it may cost 50 cents or so to fill your tires, the money you will save in fuel more than makes up for it. You can also look for service stations that offer air for free.

Should my front tires be inflated differently than my back tires?

Refer to your user’s manual. The number may be different or the same for front/back tires. Also the ideal pressure in your spare tire is usually different.