If you want to save cash on gas, take some tips from America's fuel-efficiency freaks

What happened: A Business Insider article profiles hypermilers, drivers who track and maximize their fuel economy. It cites Dave Castino, Sarah Holmes, and Hadi Ahmad, and notes the practice is making a comeback as gas prices rise. Key numbers: Castino averaged 39.4 mpg over 43,497 miles in a 2021 Mazda3, 46% above the EPA estimate, peaking at 45.6 Why it matters: Experts say modest behavior changes and basic physics offer real savings, while extreme tactics like drafting or wheel modifications can be risky or counterproductive. Modern fuel economy displays make the habit more game-like.

High-priority alert based on source significance and keyword relevance.

High-priority alert based on source significance and keyword relevance. — impact context not separately stored; see What changed.