It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.

Carnot engine

Welcome to a brand-new generation of engines. The Wärtsilä 31 is setting a new standard for energy efficiency, delivering the lowest level of fuel consumption of any four-stroke engine worldwide.

Regarding this, what’s the worst thing to put in someone’s gas tank? Sugar in a gas tank is an urban legend and it will clog up the fuel filter, just like other sticky sweet liquids such as honey, molasses, waffle syrup, pancake syrup, and similar things. Sugar does not get dissolved in gasoline.

If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don’t worry. You’re actually filling your car or truck with a different blend of gas, which means it will burn differently in your engine.

Cars have better gas mileage the fuller the gas tank. As the tank empties out, more and more gas will vaporize to fumes to fill up the volume of the tank above the liquid. That means you have less and less gas to burn.

With more pressure the Tire resistance decreases, Vehicle behaves bumpy and fuel economy increases. Vehicle feels more powerful with less tire resistance. Maybe its more to do with pressure in tires than fuel in tank.

Absolutely. If you’re cruising along a mostly level highway, electronics generally are far better at avoiding the little speed-up/slow-down events that are inevitably caused by a weary accelerator ankle or an inattentive mind.

Although the feature has its benefits and is available in more cars today than ever before, cruise control is not meant to be used every time you are behind the wheel. Using it at the wrong time could put you or other people out on the road in danger.

Fuel economy peaks at around 50 mph on most cars, then drops off as speeds increase. Reducing highway speeds by 5 to 10 mph can increase fuel economy 7 to 14 percent. Use cruise control. Minimizing speed fluctuations on the highway saves gas.

The most efficient speed for electric cars is closer to 15-20 mph versus 55 mph for ordinary cars. This is because the losses at low speeds for ordinary cars has to do with the construction and inefficiency of the gas ICE. Directly to the question at hand – they also give the sources of losses over the range of speeds.