Like gas to a car, most Americans need coffee to function every morning.

Fortunately for them, several major retailers will celebrate National Coffee Day on Thursday by offering free or discounted cups of joe. Check out the deals below, some of which are exclusive to the Sept. 29 holiday.

Caribou Coffee

The Minnesota-based chain serves its Amy's Blend roast every October in memory of Amy Erickson, one of the company's original roast masters. Customers who purchases 1lb of the signature roast between Sept. 26- Oct. 2 gets a complimentary medium brewed coffee. Proceeds from the sales will go to support CancerCare.

Coffee Bean & Tea Leaf

Non-franchised stores will hand free espresso shots to customers who download their mobile app. Those who already have it get double points.

Anyone in the market for a coffee or tea maker can buy the company's Lieto Machine online, which is accompanied by a free milk frother. Enter promo code "FROTHER" to take advantage.

Cumberland Farms

Customers who text "FREECOFFEE" to 64827 on Sept. 29 receives a digital coupon for a free Farmhouse Blend and Bold of any size, hot or cold. They are also bringing back Free Coffee Fridays beginning Oct. 7.

Dairy Queen

The soft-serve giant is getting in on National Coffee Day by offering $1 small iced coffees and unlimited frappe or fruit smoothies for $2 between 2 p.m. and 5 p.m. The promotion runs through Friday.

Dunkin' Donuts

In honor of 66 years in business, Dunkin' Donuts is selling medium-sized 66-cent cups of java on Thursday. Snapchat users can also take advantage of a photo filter exclusive to National Coffee Day.

Keurig

Keurig is offering 20 percent off Green Mountain Coffee recyclable K-cup pods, along with other discounted blends at 15 percent off. The only way to take advantage is by using promo code "GREENSAVINGS" via their official website. Online users also get $2 off of an item with the code "GMCSAVE2."

Krispy Kreme

Nothing compliments coffee like a glazed donut, which is why Krispy Kreme is giving away both for free. Anyone who stops by on Sept. 29 gets a small cup and an Original Glazed donut.

McDonald's

Given that franchises are run independently, McDonald's will not recognized National Coffee Day nationwide. Residents in southeast Pennsylvania and southern New Jersey, however, have the satisfaction of knowing all McCafé purchases will be donated to local nonprofits that serve homeless youths.

Peet's Coffee

Get a free medium cup of drip coffee with the purchase of any food item. They will also offer free shipping on non-subscription standard orders made on Peets.com.

Pilot Flying J

Truckers and road-trippers can stop by an Pilot Flying J for one free small coffee, cappuccino, or tea of their choice. All they have to do is either download or show the company's coupon off Facebook.

Quick Chek

Tri-State area residents get a free brew by downloading the retailer's mobile app.

Starbucks

For each cup of Mexico Chiapas sold on National Coffee Day, Starbucks will donate one rust-resistant coffee tree to Latin America farmers.

The charitable effort began last year after acknowledging that coffee rust, a fungus that attacks trees, makes it difficult to produce high-quality coffee. The goal is to donate 20 million trees by year's end.

Wawa

The northeastern chain offer free cups of any size at each of its locations. In Delaware, freebies are expected to attract 2 million customers.