High altitude fuel-up — low altitude engine knock

  By Russ and Tiña De Maris We got a note from a reader who’d been on a road trip out West. Piloting his pickup with a V-10 engine, towing a travel trailer, he started to encounter severe engine knocking. He got seriously concerned, thinking he’d developed engine problems. Happily, “the light came on,” and it wasn’t that dratted “check... Read More

Do “gas saving” products really help?

The answer is “probably not.” Be skeptical of the following kinds of advertising claims. “This gas-saving product improves fuel economy by 20 percent.” Claims usually tout savings ranging from 12 to 25 percent. However, the Environmental Protection Agency (EPA) has evaluated or tested more than 100 alleged gas-saving devices and has not found any product that significantly improves gas mileage.... Read More