Chevrolet Alero: Which Version Should You Buy?
The Chevrolet Alero catalogue contains one Sedan generation produced from 1999 to 2004, with four versions: 2.4 MT, 2.4 AT, 3.4 AT, and 2.2 AT. Choosing among them primarily means deciding between the lighter 2.2 AT, the transmission choice offered by the 2.4 versions, and the stronger acceleration of the 3.4 AT.
The Chevrolet Alero catalogue contains one Sedan generation produced from 1999 to 2004, with four versions: 2.4 MT, 2.4 AT, 3.4 AT, and 2.2 AT. Choosing among them primarily means deciding between the lighter 2.2 AT, the transmission choice offered by the 2.4 versions, and the stronger acceleration of the 3.4 AT. There is no generation-to-generation comparison because the data lists only one generation.
Chevrolet Alero generations and versions
The 1 generation ran from 1999 to 2004 as a Sedan and includes four versions. All four use Gasoline, FWD, a Front, transverse engine position, Distributed injection (multi-point), and no boost. Consequently, the important differences are engine displacement and configuration, output, transmission, weight, performance, and the availability of measured fuel-consumption figures.
No separate restyling or additional generation is listed. Searches for individual model years such as Chevrolet Alero 1999, 2000, 2001, or 2002 therefore refer to years within this same generation. A Chevrolet Alero coupe is not represented in the supplied catalogue data; the listed body is Sedan. Likewise, the data does not describe a Chevrolet Alero 2024 version.
Chevrolet Alero engine and transmission specs
| Version | Power | Torque | Displacement | Fuel | Cylinders | Layout | Boost | Gearbox | Drive |
|---|---|---|---|---|---|---|---|---|---|
| 2.4 MT | 141 hp (104 kW) at 5800 rpm | 199 Nm at 4200 rpm | 2392 cm³ | Gasoline, 95 | 4 | Inline | No | Manual, 5 | FWD |
| 2.4 AT | 141 hp (104 kW) at 5800 rpm | 199 Nm at 4200 rpm | 2392 cm³ | Gasoline, 95 | 4 | Inline | No | Automatic, 4 | FWD |
| 3.4 AT | 177 hp (130 kW) at 5200 rpm | 271 Nm at 4000 rpm | 3350 cm³ | Gasoline, 95 | 6 | V-shaped | No | Automatic, 4 | FWD |
| 2.2 AT | 141 hp (104 kW) at 5600 rpm | 203 Nm at 4000 rpm | 2198 cm³ | Gasoline, 95 | 4 | Inline | No | Automatic, 4 | FWD |
The 2.4 MT and 2.4 AT have identical engine figures, including 141 hp, 199 Nm, and 2392 cm³. Their defining difference is the gearbox: the 2.4 MT has a Manual with 5 gears, whereas the 2.4 AT has an Automatic with 4 gears.
The 2.2 AT produces the same 141 hp as both 2.4 versions despite having 194 cm³ less displacement. Its calculated specific output is about 64.1 hp per litre, compared with about 58.9 hp per litre for the 2.4 MT and 2.4 AT. It also develops 203 Nm, which is 4 Nm more than either 2.4 version, and reaches that peak at 4000 rpm rather than 4200 rpm.
The 3.4 AT is the output leader. Its 177 hp exceeds every other version by 36 hp, while its 271 Nm advantage is 72 Nm over the 2.4 MT and 2.4 AT and 68 Nm over the 2.2 AT. Its calculated specific output is about 52.8 hp per litre, so its advantage comes from greater total displacement and output rather than the highest power per litre.
Chevrolet Alero performance and fuel economy
| Version | 0–100 km/h | Top speed | City consumption | Highway consumption | Combined consumption |
|---|---|---|---|---|---|
| 2.4 MT | 10.6 s | 201 km/h | not measured | not measured | not measured |
| 2.4 AT | 10.6 s | 201 km/h | not measured | not measured | not measured |
| 3.4 AT | 9.2 s | 201 km/h | not measured | not measured | not measured |
| 2.2 AT | 10.8 s | 200 km/h | 9.4 l/100 km | 7.1 l/100 km | 8.4 l/100 km |
For acceleration, the 3.4 AT is the clear choice. It reaches 100 km/h in 9.2 seconds, making it 1.4 seconds quicker than both 2.4 versions and 1.6 seconds quicker than the 2.2 AT. Its 201 km/h top speed, however, is identical to the 2.4 MT and 2.4 AT and only 1 km/h above the 2.2 AT.
Transmission preference does not create a measured performance difference between the two 2.4 versions: both record 10.6 seconds to 100 km/h and 201 km/h. The 2.2 AT is 0.2 seconds slower to 100 km/h than either 2.4 version, despite matching their 141 hp and slightly exceeding their torque.
Fuel consumption was measured only for the 2.2 AT: 9.4 l/100 km in the city, 7.1 l/100 km on the highway, and 8.4 l/100 km combined. Consumption for the 2.4 MT, 2.4 AT, and 3.4 AT is not measured, so the supplied figures cannot support a numerical economy ranking between all four versions. CO₂ output and environmental class are also not measured for every version.
Chevrolet Alero dimensions, weight, and chassis specs
| Version | Kerb weight | Gross weight | Weight per hp | Ground clearance | Fuel tank | Wheel sizes |
|---|---|---|---|---|---|---|
| 2.4 MT | 1460 kg | 1852 kg | about 10.35 kg/hp | 120 mm | 57 l | not measured |
| 2.4 AT | 1480 kg | 1852 kg | about 10.50 kg/hp | 120 mm | 57 l | not measured |
| 3.4 AT | 1485 kg | 1855 kg | about 8.39 kg/hp | 120 mm | 57 l | not measured |
| 2.2 AT | 1370 kg | not measured | about 9.72 kg/hp | 120 mm | 57 l | not measured |
The 2.2 AT is the lightest version at 1370 kg. It weighs 90 kg less than the 2.4 MT, 110 kg less than the 2.4 AT, and 115 kg less than the 3.4 AT. Among the two otherwise equivalent 2.4 choices, the Manual version is 20 kg lighter than the Automatic version and therefore has a slightly better calculated weight-per-horsepower ratio.
The 3.4 AT is the heaviest at 1485 kg, but its additional 36 hp gives it the best calculated weight-per-horsepower result, about 8.39 kg/hp. That is about 1.33 kg/hp better than the 2.2 AT, about 1.96 kg/hp better than the 2.4 MT, and about 2.11 kg/hp better than the 2.4 AT. This numerical advantage corresponds with its quicker measured acceleration.
Every version has 120 mm of ground clearance and a 57 l fuel tank. Wheel sizes are not measured for any version. All versions use Independent, spring front suspension, Semi-independent rear suspension, Ventilated disc front brakes, and Disc rear brakes.
Which Chevrolet Alero version should you buy?
Choose the 3.4 AT if acceleration and total output matter most. Its 177 hp and 271 Nm are the highest figures, and its 9.2-second acceleration time is the quickest. Although it weighs 1485 kg, its calculated 8.39 kg/hp is the strongest power-to-weight result. What the larger engine buys, numerically, is 36 additional horsepower and at least 68 additional newton-metres over every alternative.
Choose the 2.2 AT if low kerb weight and documented fuel consumption are the priorities. At 1370 kg, it is the lightest choice, while retaining the same 141 hp as both 2.4 versions. It also has the highest calculated specific output at about 64.1 hp per litre. Crucially, it is the only version with measured consumption data, although this does not prove that it is more economical than versions whose consumption is not measured.
Choose between 2.4 MT and 2.4 AT according to gearbox preference. Both provide 141 hp, 199 Nm, a 10.6-second acceleration time, and a 201 km/h top speed. The 2.4 MT combines its Manual, 5 gearbox with a 1460 kg kerb weight; the 2.4 AT combines its Automatic, 4 gearbox with a 1480 kg kerb weight. On the available figures, the Manual is 20 kg lighter, while measured acceleration and maximum speed remain unchanged.
The catalogue contains no prices or sale listings, so it cannot determine whether one version justifies a higher purchase price. It also supplies no interior, problems, or reliability data. The defensible choice is therefore specification-led: 3.4 AT for the quickest acceleration, 2.2 AT for the lowest weight and the only measured economy figures, 2.4 MT for a Manual with 5 gears, or 2.4 AT for the same 2.4 performance with an Automatic, 4 gearbox.