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# Fuel Efficiency (Mass) Unit Converter

Last updated: Saturday, April 29, 2023

Fuel efficiency can be expressed using mass-specific energy consumption, which measures the amount of energy consumed per unit of mass of fuel, typically in units of joules per kilogram (J/kg). This measure is used to compare the efficiency of different types of fuels, including fossil fuels and renewable sources of energy.

Here are a few examples of fuel efficiency using mass-specific energy consumption in real-life situations:

Gasoline vs. diesel: Diesel fuel has a higher mass-specific energy than gasoline, which means that diesel engines can be more fuel-efficient than gasoline engines. This is why diesel engines are often used in large trucks and other heavy equipment.

Renewable energy: Some renewable sources of energy, such as wind and solar power, have very low mass-specific energy consumption because they do not require fuel. This means that they can be very fuel-efficient and environmentally friendly.

Efficiency improvements: Improving the efficiency of engines and other equipment can reduce their mass-specific energy consumption and increase their fuel efficiency. This can be done through technologies such as turbochargers, fuel injection systems, and lightweight materials.

The concept of mass-specific energy consumption is important for understanding the efficiency of different types of fuels and energy sources.

The SI unit of Fuel Efficiency (Mass) is joule / kilogram [ J / kg ]
Total number of units: base units (6) - derived units (2,640)
Total possible conversions: base units (30) - derived units (6,966,960)
Prefix       Base unit
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$$1.0\left(\dfrac{joule}{gram}\right)={\color{rgb(20,165,174)} x}\left(\dfrac{joule}{gram}\right)$$
yocto
[ y ]
zepto
[ z ]
atto
[ a ]
femto
[ f ]
pico
[ p ]
nano
[ n ]
micro
[ µ ]
milli
[ m ]
centi
[ c ]
deci
[ d ]
one
[ _ ]
deca
[ da ]
hecto
[ h ]
kilo
[ k ]
mega
[ M ]
giga
[ G ]
tera
[ T ]
peta
[ P ]
exa
[ E ]
zetta
[ Z ]
yotta
[ Y ]
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[ BTU / lb ]
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BTU / pound
[ BTU / lb ]
ISO, avoirdupois
BTU / pound
[ BTU / lb ]
international, metric
BTU / pound
[ BTU / lb ]
international, avoirdupois
calorie / gram
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international
joule / gram
[ J / g ]
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