Detailing · vacuums
Two labs measured suction. In different units.
Car and Driver publishes car vacuum suction in inches of water. MotorTrend publishes it in kilopascals. Both read it off the same instrument — a water-lift gauge sealed to the nozzle — and neither prints the conversion, so a reader holding both lists cannot compare a single number across them.
The same measurement, printed two ways
One inch of water column is 0.249 kPa. That is the whole conversion, and with it the two lists become one: Car and Driver's highest figure, 70 inches of water, is 17.4 kPa — which is less than the 22 kPa MotorTrend measured from two machines on its own list. Without the conversion, 70 looks like the bigger number.
And then the conversion pays for itself. Both publications tested a Black+Decker Dustbuster. Car and Driver read 16 inches of water; MotorTrend read 4 kPa. Sixteen inches of water is 3.99 kPa. Two laboratories, two instruments, two units, and a gap of 0.01 kPa.
That is the strongest corroboration on this site, and it earns both sets of figures a good deal of trust. One caveat we cannot resolve: Black+Decker sells several Dustbusters and neither test states its model number, so the two may not be the identical machine. The agreement is still worth more than either figure alone.
Suction, all on one scale
Scale runs to 22 kPa, the highest measured value here.
use it MotorTrend, Best Car Vacuums for 2026: 10 Tested Picks, 23 March 2026. Suction read on a vacuum water-lift gauge sealed to each nozzle and printed in kPa. Battery life timed to flat. Noise on a decibel meter during normal use. Pickup measured as the mass in grams recovered from a doormat divided into six sections loaded with sand, gravel, potting soil, orchid bark, cereal and dog hair, one 15-second pass at constant speed, and from a purpose-built wooden crevice loaded the same way.
The control on that chart is the machine at the coin-operated car wash, at 14.5 kPa for about a dollar. Four of the ten vacuums tested do not beat it.
What suction does not tell you
Suction is the number every listing quotes and it does not rank these machines. MotorTrend also weighed what each one actually recovered: a doormat divided into six sections, loaded with sand, gravel, potting soil, orchid bark, cereal and dog hair, one fifteen-second pass at constant speed, then the pickup weighed.
Scale runs to 580.7 g, the highest measured value here.
use it MotorTrend, Best Car Vacuums for 2026: 10 Tested Picks, 23 March 2026. Suction read on a vacuum water-lift gauge sealed to each nozzle and printed in kPa. Battery life timed to flat. Noise on a decibel meter during normal use. Pickup measured as the mass in grams recovered from a doormat divided into six sections loaded with sand, gravel, potting soil, orchid bark, cereal and dog hair, one 15-second pass at constant speed, and from a purpose-built wooden crevice loaded the same way.
The two charts disagree, and that is the finding. The Black+Decker has the weakest suction of the ten by a wide margin — 4 kPa against the Dyson's 22 — and it recovered 512 g, more than the Fanttik that pulls more than twice its vacuum. It has a beater bar. A brush that agitates the carpet beats raw pressure on a floor mat, and no suction figure will ever tell you that.
Ten vacuums, as measured
| Product | Suction kPa use it | Floor mat g recovered use it | Runtime min:sec use it | Weight lb use it | Noise dB use it | Where to buy |
|---|---|---|---|---|---|---|
| Dyson Car & Boat our pick 22 kPa for 6:49, or 7 kPa for 46:38 | 22 | 536.2 | 6:49 | 4.05 | 84.0 | Check on Amazon |
| Bissell PowerClean FurGuard Same peak suction, twice the runtime, heavier | 22 | — | 13:58 | 5.25 | 78.5 | Check on Amazon |
| Milwaukee M18 handheld Held 16.5 kPa average for over 20 min. Battery sold separately | 18 | 359.7 | 21:18 | 3.57 | 86.0 | |
| Craftsman V20 stick | 15 | 553.6 | 17:45 | 4.70 | 80.9 | |
| Hedgehog Turbovac Lightest of the lot at under a pound | 14 | — | 10:21 | 0.91 | 76.0 | Check on Amazon |
| Coin-op car wash vacuum The control. About $1 for four minutes | 14.5 | — | — | — | 79.8 | |
| Milwaukee M18 2.5 gal shop vac | 12 | 541.1 | 24:17 | 12.75 | 78.0 | |
| Craftsman 12 gal corded shop vac Best pickup of the ten, and 21 lb | 12 | 580.7 | mains | 21.12 | 86.0 | |
| Fanttik V10 Apex Average rather than peak; second-best floor mat score | 10.7 | 490.4 | 13:23 | 2.66 | 76.0 | Check on Amazon |
| Hoto handheld 0.4 litres of space. Canister fills fast | 19 | 206.6 | 4:25 | 1.01 | 75.0 | Check on Amazon |
| Black+Decker Dustbuster Furbuster Beater bar carries it despite the lowest suction here | 4 | 512.0 | 5:27 | 2.11 | 90.7 | Check on Amazon |
use it MotorTrend, Best Car Vacuums for 2026: 10 Tested Picks, 23 March 2026. Suction read on a vacuum water-lift gauge sealed to each nozzle and printed in kPa. Battery life timed to flat. Noise on a decibel meter during normal use. Pickup measured as the mass in grams recovered from a doormat divided into six sections loaded with sand, gravel, potting soil, orchid bark, cereal and dog hair, one 15-second pass at constant speed, and from a purpose-built wooden crevice loaded the same way.
Two rows we will not print
The source's own table gives the Bissell PowerClean and the Hedgehog Turbovac identical scores in both pickup tests — 259.4 g on the floor mat and 180.7 g in the crevice, to the tenth of a gram, on a 5.25 lb stick vacuum and a 0.91 lb handheld.
Two different machines producing the same figure to one decimal place in two separate tests is not a coincidence; it is almost certainly one row copied over the other. We have left both cells empty in the table above rather than reprint a figure we think is a transcription error, and we have not used either in the chart. If MotorTrend corrects it we will fill them in.
What nobody has measured
- Suction with a full canister. The source notes the Hoto "suffers once the canister is full" but did not measure it, and a vacuum you empty three times per car is a different product from its spec sheet.
- Filter life. Nobody has published how quickly suction drops as a washable filter loads, which is the thing that actually decides how a cheap vacuum feels a year in.
- Pet hair specifically. Dog hair was mixed into the general debris rather than weighed separately, so the beater-bar advantage visible in the Black+Decker's result is not isolated anywhere.