Approximate, from ECB reference rates. Not an offer.
Honda Civic Si Sedan vs Mazda3 Sedan
Key differences
Mazda3 Sedan is 13 mm (0.5 in) shorter than Honda Civic Si Sedan and has 25 L less cargo space.Mazda3 Sedan is 13 mm (0.5 in) shorter than Honda Civic Si Sedan and has 25 L (0.9 cu ft) less cargo space.
Honda Civic Si Sedan makes 10 kW (14 hp) more power than Mazda3 Sedan.
Mazda3 Sedan costs US$6,845 less than Honda Civic Si Sedan (list prices, excl. tax).
Mazda3 Sedan is 13 mm (0.5 in) shorter than Honda Civic Si Sedan.
Mazda3 Sedan is 35 mm (1.4 in) taller than Honda Civic Si Sedan.
Mazda3 Sedan has a wheelbase 11 mm (0.4 in) shorter than Honda Civic Si Sedan.
Blue solid line: Honda Civic Si Sedan; orange dashed line: Mazda3 Sedan.The outlines are generic body shapes drawn at one scale, not the real design of any model.
Honda Civic Si Sedan is 4,674 mm (184 in) long and 1,410 mm (55.5 in) high, with a wheelbase of 2,736 mm (107.7 in). Mazda3 Sedan is 4,661 mm (183.5 in) long and 1,445 mm (56.9 in) high, with a wheelbase of 2,725 mm (107.3 in).
Mazda3 Sedan is 5 mm (0.2 in) narrower than Honda Civic Si Sedan.
Blue solid line: Honda Civic Si Sedan; orange dashed line: Mazda3 Sedan.
Honda Civic Si Sedan is 1,801 mm (70.9 in) wide and 1,410 mm (55.5 in) high. Mazda3 Sedan is 1,796 mm (70.7 in) wide and 1,445 mm (56.9 in) high.
Blue solid line: Honda Civic Si Sedan; orange dashed line: Mazda3 Sedan.
Honda Civic Si Sedan is 1,801 mm (70.9 in) wide and 1,410 mm (55.5 in) high. Mazda3 Sedan is 1,796 mm (70.7 in) wide and 1,445 mm (56.9 in) high.
Compare specifications
A check mark shows the better value in a row. Range and efficiency check marks compare only values from the same test cycle. Prices are each market's own list prices, compared within that market; some include tax and some do not, and no price is marked better when the tax treatment differs. Energy cost is what the energy for 100 km (100 mi where the market uses miles) costs at the market's latest published national energy price, in its own currency, with the price's source and date.
260 Nm192 lb-ft (260 Nm)Better value on this metric
252 Nm186 lb-ft (252 Nm)
Engine and fuel
Fuel use
30.9 mpg7.6 L/100 km (EPA)37.2 mpg (EPA)Better value on this metric
30.2 mpg7.8 L/100 km (EPA)36.2 mpg (EPA)
Fuel tank
46.9 L
–Not available
Engine size
1,498 cc
2,488 cc
Practicality
Seats
5
5
Cargo space
399 L399 L (14.1 cu ft)Better value on this metric
374 L374 L (13.2 cu ft)
Honda Civic Si Sedan
Specifications: Manufacturer official pages, cited per row, checked . automobiles.honda.com
Source detailsExact factors: in x 25.4; hp x 0.745699872; l/100km = 235.214583 / combined mpg; lb-ft x 1.3558179483314004; lb x 0.45359237; cu ft x 28.316846592; gal x 3.785411784.
Mazda3 Sedan
Specifications: Manufacturer official pages, cited per row, checked . www.mazdausa.com
Source detailsEPA check: fueleconomy.gov 2026 combined 30 mpg, page 30. Exact factors: cu ft x 28.316846592; hp x 0.745699872; in x 25.4; l/100km = 235.214583 / mpg; lb-ft x 1.3558179483314004.
Other specifications: Manufacturer official pages, cited per row, checked . www.mazdausa.com