Experts say E15 is approved for vehicles made since 2001, and Natural Resources Canada says ethanol blends raise fuel use by about 2%.
Bradley Saville, a University of Toronto chemical engineering professor, said fears about E15 damage are exaggerated, citing U.S. Environmental Protection Agency approval for vehicles made since 2001.
Iran's blockade of the Strait of Hormuz following February attacks by the United States and Israel drove global fuel prices higher, prompting the EPA on March 25 to temporarily allow E15 sales.
A March 30 Instagram post with around 35,000 likes claimed E15 damages vehicles built before 2021 and "won't last," while an April 10 TikTok video warned E15 would "destroy gas-powered vehicles."
Saville clarified that E15 is fully warranted by most automakers except Mazda, and damage to pre-2001 vehicles is typically limited to fuel system parts, not engines as some posts claimed.
Ontario requires 11 per cent ethanol in gasoline, escalating to 13 per cent in 2028 and 15 per cent in 2030 under Clean Fuel Regulations; Natural Resources Canada found ethanol increases fuel consumption by an average of 2 per cent.