Growing up in snowy northern Michigan, I got used to the idea of my mom putting bags of cement in the trunk (over the rear wheels) to "improve traction" during the winter months, when at any given time, the snow could be piled up knee-high on the country roads. This made sense to my child brain, but now as an adult I'm scratching my head a bit.
- Does adding ~100lbs of weight over the rear wheels actually help anything?
- If so, does it only help in a rear-wheel drive car?
- Would it also provide useful traction improvement on rainy days?
- And finally, is the effect (if any) worth the cost in decreased gas mileage?