MPG TO L/100KM

21 MPG to L/100km and km/L.

21 US MPG = 11.20 L/100 km = 8.93 km/L.
21 UK MPG = 13.45 L/100 km = 7.43 km/L.
The answer depends on which gallon your figure uses. UK (imperial) gallons are about 20% bigger.

21 US MPG

11.20L/100 km

Litres per km: 0.1120 L/km
Kilometres per litre: 8.93 km/L
Equivalent UK MPG: 25.22

Use this for US car specs, EPA ratings and American reviews.

21 UK (imperial) MPG

13.45L/100 km

Litres per km: 0.1345 L/km
Kilometres per litre: 7.43 km/L
Equivalent US MPG: 17.49

Use this for UK, Irish and older Australian or Canadian figures.

Convert a different MPG figure 11 L/100km to MPG

Is 21 MPG good?

As US MPG (11.2 L/100 km): thirsty. That is thirsty, typical of large SUVs, utes and pickups, and performance cars.

As UK MPG (13.5 L/100 km): thirsty. That is thirsty, typical of large SUVs, utes and pickups, and performance cars.

A rough guide for passenger vehicles. Real-world use varies with driving style, speed, load and conditions, and is often higher than official test figures.

Fuel used at 21 MPG

Distance	US MPG	UK MPG
100 km	11.2 L	13.5 L
500 km	56.0 L	67.3 L
1,000 km	112.0 L	134.5 L
15,000 km (a typical year)	1,680.1 L	2,017.7 L
Range on a 50 L tank	446 km	372 km

What does that cost to run?

Enter your local fuel price per litre to see the running cost.

Fuel price per litre Distance per year (km)

	21 US MPG	21 UK MPG
Per 100 km	—	—
Per year	—	—

Want trip costs, miles, gallon prices or a two-car comparison? Use the full fuel cost calculator.

MPG values near 21

MPG	US L/100 km	UK L/100 km	US km/L	UK km/L
16 MPG	14.70	17.66	6.80	5.66
17 MPG	13.84	16.62	7.23	6.02
18 MPG	13.07	15.69	7.65	6.37
19 MPG	12.38	14.87	8.08	6.73
20 MPG	11.76	14.12	8.50	7.08
21 MPG	11.20	13.45	8.93	7.43
22 MPG	10.69	12.84	9.35	7.79
23 MPG	10.23	12.28	9.78	8.14
24 MPG	9.80	11.77	10.20	8.50
25 MPG	9.41	11.30	10.63	8.85
26 MPG	9.05	10.86	11.05	9.20

How to convert 21 MPG to L/100km and km/L

Divide a fixed constant by the MPG figure. The constant is the litres in one gallon, divided by the kilometres in one mile, multiplied by 100.

US: 235.215 ÷ 21 = 11.20 L/100 km

UK: 282.481 ÷ 21 = 13.45 L/100 km

For kilometres per litre, multiply instead: US MPG × 0.4251 = km/L, so 21 US MPG = 8.93 km/L. For UK MPG use × 0.3540, so 21 UK MPG = 7.43 km/L.

Based on 1 mile = 1.609344 km, 1 US gallon = 3.785411784 L and 1 imperial gallon = 4.54609 L (NIST definitions).