Ever thought if you should leave your vehicle in gear or in neutral when going down a hill? Now we’ve got an answer.
There are a few schools of thought when it comes to driving a vehicle down a hill. Some people will leave a vehicle in a higher gear and use the brakes, while others will depend on engine braking to maintain a constant speed. And, of course, there are people every particular way in between.
But which method–neutral or engine braking–actually conserves more fuel while making you at a safe speed? You’d probably feel that being in neutral was likely to give you better fuel economy, but that isn’t necessarily the situation.
Leaving the vehicle in gear can actually use a lot less fuel than leaving it in neutral, since the computers has to inject fuel to keep it running in neutral, but not when the engine is spinning while the engine is braking.
Of course, that’s a rudimentary explanation. For the full deal, check out the video from Engineering Explained.