Fuel Saving Tips
Switching from a heavier oil (like 10w-30) to a lighter oil (such as 5w-30) can have a huge impact on how your engine runs. It costs a lot of parasitic drag to pump that heavier oil through the engine. I've noticed a 4 mpg improvement in two of my cars going to a synthetic 5w-30 motor oil.
posted by flyzizzerz on August 15, 2016
this tip works for 21% of voting Fuelly members.