Below is a non-technical article on the subject. Large heavy utility diesel trucks like garbage trucks have huge engines, extreme start-stop patterns, lots of

Below is a non-technical article on the subject. Large heavy utility diesel trucks like garbage trucks have huge engines, extreme start-stop patterns, lots of shifting. Those are loud by themselves. Also, they are low production volume and are only noise insulated in as far as regulation requires them. https://www.washingtonpost.com/business/economy/americas-best-selling-cars-and-trucks-are-built-on-lies-the-rise-of-fake-engine-noise/2015/01/21/6db09a10-a0ba-11e4-b146-577832eafcb4_story.html https://www.washingtonpost.com/business/economy/americas-bes...