What Is 30 MPG in L/100km? (And Is 30 MPG Good?)

If you are comparing a vehicle’s fuel economy across different countries or reading a European spec sheet, you will need to convert MPG (miles per gallon) to L/100km (liters per 100 kilometers). The two scales move in opposite directions: higher MPG means better efficiency, while lower L/100km means better efficiency. That can make side-by-side comparisons confusing without a reliable reference point.

The Conversion: 30 MPG to L/100km

The formula for converting MPG to L/100km uses the constant 235.215, which accounts for the difference between US gallons and liters, and between miles and kilometers. You divide that constant by the MPG figure:

L/100km = 235.215 / MPG

For 30 MPG specifically:

235.215 / 30 = 7.84 L/100km

So a vehicle rated at 30 MPG will consume approximately 7.84 liters of fuel for every 100 kilometers driven. You can convert any figure quickly using our MPG to L/100km Converter or run your own calculations with the MPG Calculator.

Is 30 MPG Good?

The honest answer is: it depends entirely on the type of vehicle. Fuel economy expectations vary significantly by class, and a number that represents outstanding performance in one segment can be mediocre in another.

For trucks and large SUVs, 30 MPG combined is genuinely excellent. Full-size pickup trucks and body-on-frame SUVs typically average between 16 and 22 MPG combined. Hitting 30 MPG in that segment would put a vehicle among the very best in class, and in practice, only a handful of plug-in hybrid or mild-hybrid variants get close.

For compact and midsize SUVs, which are the most popular vehicle category in the United States, 30 MPG combined sits at the higher end of normal. Most crossovers in this segment range from 27 to 34 MPG, so 30 MPG represents a solid, competitive number without being exceptional.

For sedans and hatchbacks, 30 MPG combined is roughly average to slightly below average for a non-hybrid model. Compact sedans from Honda, Toyota, and Mazda routinely achieve 32 to 36 MPG combined. If a sedan is rated at 30 MPG, it is respectable but not a standout.

For hybrids and plug-in hybrids, 30 MPG is below average. Most conventional hybrids in the compact to midsize range achieve 40 to 52 MPG combined, so 30 MPG would indicate either an older hybrid system or a larger vehicle.

Cars That Achieve Around 30 MPG Combined

Several popular and widely available vehicles land at or near 30 MPG combined:

The Toyota RAV4 (non-hybrid) is rated at approximately 30 MPG combined in its standard all-wheel-drive configuration. It is one of the best-selling vehicles in the United States, which means 30 MPG is the fuel economy benchmark for millions of drivers.

The Honda CR-V also achieves around 30 MPG combined in its base configuration, depending on trim and drivetrain. Like the RAV4, it represents what a well-engineered modern crossover can deliver in everyday driving.

The Mazda3 sedan reaches approximately 30 to 32 MPG combined in its base engine configuration, sitting at the low end of what compact sedans typically achieve but still a strong performer in terms of overall driving experience and efficiency balance.

The Subaru Impreza delivers around 30 to 32 MPG combined, notable because it comes standard with all-wheel drive, which typically reduces fuel efficiency. Achieving 30 MPG while offering standard AWD is a meaningful engineering accomplishment.

Annual Fuel Cost at 30 MPG

Real-world cost matters more to most drivers than the abstract MPG number. Using standard assumptions: 15,000 miles driven per year and a fuel price of $3.50 per gallon, the math works out as follows:

Gallons used per year = 15,000 / 30 = 500 gallons

Annual fuel cost = 500 x $3.50 = $1,750 per year

That works out to roughly $146 per month in fuel. By comparison, a vehicle getting 20 MPG on the same assumptions would cost $2,625 per year, meaning 30 MPG saves approximately $875 annually over a less efficient alternative. Over five years of ownership, that gap grows to more than $4,000 at current prices.

30 MPG vs the US Fleet Average

The US Environmental Protection Agency tracks the average fuel economy of new vehicles sold each year. As of recent model years, the combined fleet average sits at approximately 28 MPG across all new passenger cars and light trucks. A vehicle rated at 30 MPG is roughly 7 percent better than that average.

That may not sound dramatic, but it compounds meaningfully over time. A driver putting 15,000 miles per year on a 30 MPG vehicle rather than a 28 MPG vehicle saves about $94 per year in fuel at $3.50 per gallon. Over a typical ownership period of seven years, that is more than $650 in savings from a difference of just 2 MPG.

MPG to L/100km Reference Table

The following table covers a range of common MPG values and their L/100km equivalents, using the 235.215 constant:

MPG	L/100km
25	9.41
30	7.84
35	6.72
40	5.88
45	5.23

Notice that the relationship is not linear: the difference between 25 and 30 MPG (1.57 L/100km) is larger than the difference between 40 and 45 MPG (0.65 L/100km). This compression effect means that improving efficiency matters more at the low end of the MPG scale. Going from 25 to 30 MPG delivers a much larger real-world fuel saving than going from 40 to 45 MPG, even though both represent the same 5 MPG numerical jump.

For quick conversions at any value, use the MPG to L/100km Converter or check your combined city and highway figures with the MPG Calculator.