Hummer H3

The article is built only from the supplied spec sheet: eight named versions, compared by power, weight, economy, and tank size, with duplicate names kept exactly as in the data.

The Hummer H3 ran as 1 generation from 2005-04-01 to 2013-03-31 in one body, SUV 5-doors, with 8 versions. Every version is AWD, Gasoline, naturally aspirated (No boost), and uses a front, longitudinal engine. The buying question is not “which generation” — there is only one — but which of the eight named lines: 3.7 MT, 3.5 MT, 3.7 AT, 3.5 AT, 5.3 AT, 3.7 AT, 3.7 MT, and 5.3 AT. Two names repeat.

The article is built only from the supplied spec sheet: eight named versions, compared by power, weight, economy, and tank size, with duplicate names kept exactly as in the data.

# Hummer H3: which version to buy (2005–2013)

The Hummer H3 ran as 1 generation from 2005-04-01 to 2013-03-31 in one body, SUV 5-doors, with 8 versions. Every version is AWD, Gasoline, naturally aspirated (No boost), and uses a front, longitudinal engine. The buying question is not “which generation” — there is only one — but which of the eight named lines: 3.7 MT, 3.5 MT, 3.7 AT, 3.5 AT, 5.3 AT, 3.7 AT, 3.7 MT, and 5.3 AT. Two names repeat. Distinguish them by the numbers that actually differ: the two 3.7 MT lines both make 245 hp, but one has 327 Nm and an 87 L tank, the other 328 Nm and 102 L; the two 3.7 AT lines both make 245 hp, again 327 Nm / 87 L versus 328 Nm / 102 L; the two 5.3 AT lines both make 300 hp, but one is quoted at 8.6 s to 100 km/h with an 87 L tank and kerb weight not measured, the other at 9.0 s with 102 L and 2299 kg.

Hummer H3 specs by version (engine, gearbox, drive)

The 3.7 engines are 3653 cm³, 5 cylinders Inline, 4 valves per cylinder, multi-point injection. Compression is 10.4 with bore × stroke 93 × 102 on the 87 L pair, and 10.1 with 95.5 × 102 on the 102 L pair. The 3.5 engines are 3465 cm³, same 5 Inline layout, 4 valves, compression 10.4, bore × stroke 93 × 102. The 5.3 AT engines are 5328 cm³, 8 cylinders V-shaped. On the 102 L 5.3 AT, valves per cylinder are 2, compression 9.9, bore × stroke 96 × 91.9. On the 87 L 5.3 AT, valves per cylinder, compression, and bore × stroke are not measured.

Power per litre (hp ÷ displacement in litres): 3.7 245 / 3.653 ≈ 67.1 hp/L; 3.5 223 / 3.465 ≈ 64.4 hp/L; 5.3 300 / 5.328 ≈ 56.3 hp/L. The smallest five-cylinder is the most specific-output engine in this catalogue; the V-shaped eight buys peak torque, not density.

Hummer H3 mpg, 0–100, and top speed: what is measured

Among measured 0–100 figures, 5.3 AT (8.6 s, 87 L) is the quickest at 8.6 s — 0.3 s faster than both 3.7 MT lines (8.9 s) and 0.7 s faster than every measured Automatic five-cylinder (9.3 s). The other 5.3 AT (9.0 s, 102 L) is 9.0 s: 0.1 s slower than the manuals at 8.9 s, 0.3 s faster than the 3.7 AT lines at 9.3 s, and 0.4 s slower than its own nameplate sibling at 8.6 s. 3.5 MT 0–100 is not measured; 3.5 AT matches the 3.7 AT time at 9.3 s despite 22 hp less (223 vs 245) and 22 Nm less (305 vs 327 or 328).

Top speed is measured on five versions only. Both 3.7 MT lines are 180 km/h — 20 km/h above both 3.7 AT lines (160 km/h) and 24 km/h above both 3.5 lines (156 km/h). Both 5.3 AT top speeds are not measured. The extra 55 hp of the eight-cylinder versus 3.7 (300 − 245) does not come with a catalogue top-speed figure.

Fuel use is measured on four of eight versions. The leanest mixed figure is 13.5 L/100 km on 3.7 MT (327 Nm, 87 L) and 3.7 AT (327 Nm, 87 L). The 102 L 3.7 pair is 15 L/100 km mixed — 1.5 L/100 km higher. 5.3 AT (9.0 s, 102 L) is 16.4 L/100 km mixed: 2.9 L/100 km above the 13.5 pair and 1.4 L/100 km above the 15 pair. City/highway on that 5.3 AT are 18.1 / 14.7. 3.5 MT, 3.5 AT, and 5.3 AT (8.6 s, 87 L) fuel figures are not measured.

Implied mixed range (tank ÷ mixed × 100): 87 / 13.5 × 100 ≈ 644 km on the 87 L 3.7 pair; 102 / 15 × 100 = 680 km on the 102 L 3.7 pair; 102 / 16.4 × 100 ≈ 622 km on 5.3 AT (9.0 s, 102 L). The larger tank on the thirstier 3.7 still buys about 36 km more mixed range than the 87 L 3.7. The 102 L 5.3 AT has a larger tank than the 87 L 3.7 but a shorter implied mixed range (≈622 vs ≈644 km) because mixed consumption is 16.4 vs 13.5.

Hummer H3 dimensions, weight, and ground clearance

Wheel sizes are not measured on all eight versions. Ground clearance is 230 mm on six versions and not measured on 3.5 MT and 3.5 AT. Front suspension is Independent, torsion and rear Dependent, leaf spring on every version; front and rear brakes are disc on every version.

3.5 MT is the lightest measured kerb at 2115 kg — 116 kg under the 87 L 3.7 pair (2231 kg), 20 kg under 3.5 AT (2135 kg), 123 kg under the 102 L 3.7 pair (2238 kg), and 184 kg under 5.3 AT (9.0 s, 102 L) at 2299 kg. Payload (gross − kerb) where both exist: 3.7 87 L pair 2660 − 2231 = 429 kg; 3.5 MT 2564 − 2115 = 449 kg; 3.5 AT 2564 − 2135 = 429 kg; 102 L 3.7 pair 2660 − 2238 = 422 kg; 5.3 AT (9.0 s) 2654 − 2299 = 355 kg. The eight-cylinder with a measured kerb carries the least payload of the set.

Weight per horsepower: 3.5 MT 2115 / 223 ≈ 9.48 kg/hp; 3.5 AT 2135 / 223 ≈ 9.57; 87 L 3.7 2231 / 245 ≈ 9.11; 102 L 3.7 2238 / 245 ≈ 9.13; 5.3 AT (9.0 s, 102 L) 2299 / 300 ≈ 7.66. The 5.3 AT with a measured kerb is the lightest per horsepower even though it is the heaviest in kilograms. Kerb for 5.3 AT (8.6 s, 87 L) is not measured, so kg/hp for that line cannot be stated.

Which Hummer H3 version to choose

There is 1 generation, so the choice is inside one SUV 5-doors window (2005-04-01 to 2013-03-31). Drive is AWD on all eight; nobody is choosing two-wheel drive.

Buy 3.7 MT if you want the highest measured top speed and the shortest five-cylinder 0–100. Both 3.7 MT lines: 245 hp at 5600 rpm, Manual 5, 8.9 s, 180 km/h. The 87 L 3.7 MT (327 Nm) is the economy pick among measured manuals: mixed 13.5 L/100 km, tank 87 L, kerb 2231 kg. The 102 L 3.7 MT (328 Nm) is 1 Nm and 7 kg heavier, mixed 15 L/100 km, tank 102 L (+15 L). Torque peaks at 4600 rpm on both, versus 2800 rpm on the 3.5 engines — the 3.7 makes more peak torque later.

Buy 3.7 AT if you want Automatic and still 245 hp. Both 3.7 AT lines: Automatic 4, 9.3 s, 160 km/h, 245 hp / 180 kW. Versus matching 3.7 MT, you give up 0.4 s to 100 km/h and 20 km/h of top speed for four automatic ratios instead of five manual. Fuel grade is 95 on both 3.7 AT lines and 92 on both 3.7 MT lines. The 87 L 3.7 AT (327 Nm) matches the 87 L 3.7 MT on 14.7 / 11.8 / 13.5; the 102 L 3.7 AT (328 Nm) matches the 102 L 3.7 MT on 16.8 / 13.1 / 15. Gearbox, not tank, is what changes speed; tank is what changes range.

Buy 3.5 MT or 3.5 AT only if kerb mass is the priority and you accept missing figures. 3.5 MT: 223 hp, 305 Nm at 2800 rpm, Manual 5, kerb 2115 kg (lightest measured), top speed 156 km/h, 0–100 not measured, fuel not measured, clearance not measured. 3.5 AT: same engine, Automatic 4, 9.3 s, 156 km/h, kerb 2135 kg (+20 kg vs 3.5 MT), fuel and clearance not measured. Versus 3.7, you give up 22 hp and 22–23 Nm. 3.5 AT 0–100 equals 3.7 AT at 9.3 s despite less power, with 96 kg less kerb than the 87 L 3.7 (2135 vs 2231). You cannot compare mpg: 3.5 consumption is not measured.

Buy 5.3 AT if you want 300 hp and 434 Nm. Both 5.3 AT lines: 8 cylinders V-shaped, Automatic 4, AWD, 300 hp / 221 kW at 5200 rpm, 434 Nm at 4000 rpm. That is 55 hp and 106–107 Nm more than any 3.7. 5.3 AT (8.6 s, 87 L) is the fastest measured 0–100 in the model at 8.6 s; top speed, fuel, kerb, valves, compression, and bore × stroke are not measured; tank 87 L; gross 2654 kg; clearance 230 mm. 5.3 AT (9.0 s, 102 L) is the only eight-cylinder with a full measured set: 9.0 s, mixed 16.4 L/100 km, kerb 2299 kg, tank 102 L, 2 valves per cylinder. It is 0.4 s slower than the other 5.3 AT and 0.1 s slower than 3.7 MT, while using 2.9 L/100 km more mixed than the 13.5 3.7 pair. Payload on the measured-kerb 5.3 AT is 355 kg, 74 kg less than the 87 L 3.7 pair’s 429 kg.

What the extra displacement buys, in arithmetic. Going 3.5 → 3.7 is +188 cm³, +22 hp, +22 or +23 Nm, and on measured Automatic lines the same 9.3 s. Going 3.7 → 5.3 is +1675 cm³, +55 hp, +106 or +107 Nm. Specific output falls (67.1 → 56.3 hp/L). On the one 5.3 AT with mixed fuel, you pay 16.4 vs 13.5 or 15. The 102 L tank versus 87 L is +15 L (≈17% more fuel on board).

A short decision list using only these numbers. Fastest measured 0–100: 5.3 AT (8.6 s, 87 L). Highest measured top speed: either 3.7 MT. Lowest measured mixed consumption: either 87 L 3.7 (13.5). Largest tank: the three 102 L versions (3.7 AT, 3.7 MT, 5.3 AT). Lightest measured kerb: 3.5 MT (2115 kg). Best measured kg/hp: 5.3 AT (9.0 s, 102 L) at ≈7.66. Same 0–100 with less power: 3.5 AT and both 3.7 AT at 9.3 s. Do not infer mpg for 3.5 MT, 3.5 AT, or 5.3 AT (8.6 s, 87 L): those figures are not measured. Do not infer top speed for either 5.3 AT: not measured. Do not infer wheels for any version: not measured.