Copyright jalopnik
When you drop an engines cylinder count to three, there aren't as many moving parts generating friction. Any time you have metal surfaces contacting each other, there will be something called mechanical friction loss. Essentially, as metal components rub against one another, heat is generated. This heat represents the energy used and lost as engine components work against each other's surface resistance. This is present even when fluids and lubrication are at optimal levels. However, with one less cylinder, these compact engines not only use less fuel because of the reduced friction, but it could also translate into lower maintenance costs. Essentially, an engine with fewer moving parts has less potential points of failure. Many drivers fail to consider the price of their vehicles beyond the initial purchase. Just look at these car brands that cost the most to maintain and repair over 10 years according to Consumer Reports for an idea of how bad things can get. Depending on the 3-cylinder, it could offer a less complex design than a 4-cylinder, potentially saving you money.
