The numbers are in: Taco Bell's Doritos taco is now officially the chain's most popular product ever.
The Doritos Locos taco features a nacho cheese-flavored shell made of the iconic chip, which is then stuffed with seasoned beef, lettuce and tomato. It goes for $1.29.
The Orange County Register's Nancy Luna reports that about 100 million were sold in roughly 10 weeks, which puts it shoulders above any other dish in Taco Bell's 50-year history, including the former champion, Crunchwrap Supreme.
For some perspective, Luna notes that McDonald's sold its first 100 million burgers in 1958, 18 years after the first location was opened.
The Doritos taco has been credited with reenergizing Taco Bell sales following a lawsuit that zapped business for nearly a year. The suit, which was dropped three months after it was filed, alleged that the chain's meat filling didn't have enough beef to warrant being called that.
Taco Bell hopes to capitalize on the product's popularity by rolling out more flavors. Up next: Cool Ranch Hot and Spicy versions.
America's Biggest Fast Food Chains
America's Drive-In rounds out the top 10 with U.S. revenues of $3.6 billion.
KFC, the biggest chicken vendor in America, comes in ninth with revenues of $4.7 billion, though there were 107 fewer outposts in August 2011 than there were the year before.
8. Pizza Hut
<a href="http://www.huffingtonpost.com/2011/07/27/pizza-hut-ads_n_911106.html" target="_hplink">Good ads</a> equal big revenues for the biggest pizza chain in America. Pizza Hut took in a solid $5.4 billion in 2010.
7. Dunkin Donuts
America runs on Dunkin' to the tune of $6 billion a year -- that's almost $20 for each and every person in the country.
6. Taco Bell
2010 U.S. revenues of $6.9 billion make Taco Bell the biggest Mexican restaurant chain in the country.
Starbucks may have had a few hiccups <a href="http://www.huffingtonpost.com/2011/07/13/starbucks-bistro-boxes_n_897768.html" target="_hplink">when it comes to introducing food</a>. But its success in beverages has propelled American's biggest coffee purveyor into fifth place among fast food chains, with 2010 revenues of $7.6 billion.
Wendy's fries may be <a href="http://www.slashfood.com/2011/04/20/wendys-fries-vs-mcdonalds-fries-taste-test/" target="_hplink">number one</a>, but its revenues aren't there quite yet.
3. Burger King
Number two burger chain Burger King was sold for $3.26 billion to 3G Capital in 2009. 2010 revenues of $8.6 billion make that sound like a deal to us! (We know, we know, there's a difference between revenues and profits...)
Subway has the most outlets of any fast food brand; it expanded that total by 816 in the past year alone. But because each store is relatively small, revenues, at $10 billion, pale in comparison with those at the number one chain.
With revenues standing at a whopping $32.4 billion in 2010, the Golden Arches aren't being dethroned any time soon. What's surprising about its success is that per store sales at McDonald's are bigger than those even cult-ish brands with fewer outlets. With $2.4 million <em>per store</em>, they're second only to Chick Fil-A, which fans travel miles to visit.