BMW Z4 vs rivals - specifications
| Porsche Boxster | BMW Z4 sDrive23i | Mercedes SLK 280 | |
|---|---|---|---|
| On the road price/total as tested | £33,704/£43,324 | £28,650/£32,045 | £32,290/£36,028 |
| Residual value (after 3yrs/36,000) | £12,909/38.3% | £9,540/33.3% | £15,499/48.0% |
| Annual tax liability std/higher rate | £2,224/£4,449 | £1,547/£3,094 | £2,067/£4,133 |
| Annual fuel cost (12k/20k miles) | £2,015/£3,359 | £1,706/£2,844 | £2,046/£3,410 |
| Insurance group/quote | 43/£765 | 40/N/A | 42/£514 |
| Road tax band/cost | K/£215 | J/£215 | K/£215 |
| Cost of 1st/2nd/3rd service | £438/£577/£438 | £885 (5yrs inclusive) | £229/£329/£229 |
| Length/wheelbase | 4,342/2,415mm | 4,239/2,496mm | 4,103/2,430mm |
| Height/width | 1,292/1,801mm | 1,291/1,790mm | 1,296/1,777mm |
| Engine | 6cyl boxer/2,893cc | 6cyl in-line/2,497cc | 6cyl V6/2,996cc |
| Peak power | 251/7,200 bhp/rpm | 201/6,400 bhp/rpm | 227/6,000 bhp/rpm |
| Peak torque | 290/4,400 Nm/rpm | 250/2,750 Nm/rpm | 300/2,500 Nm/rpm |
| Transmission | 6-spd man/rwd | 6-spd man/rwd | 6-spd man/rwd |
| Fuel tank capacity/spare wheel | 64litres/foam sealant | 55 litres/run-flats | 70 litres/space saver |
| Boot capacity (roof up/down) | 280/280 litres* | 310/180 litres | 300/208 litres |
| Kerbweight/payload | 1,335/300kg | 1,480/330kg | 1,455/315kg |
| Turning circle/drag coefficient | 11.1 metres/0.29Cd | 10.7 metres/0.34Cd | 10.5 metres/N/A |
| Basic warranty (miles)/recovery | 2yrs (unltd)/2yrs | 3yrs (unltd)/3yrs | 3yrs (unltd)/4yrs |
| Service intervals/UK dealers | 20,000 miles/34 | Variable miles/223 | 15,000 miles/136 |
| Driver Power maker/dealer pos. | 3rd (09)/5th (08) | 8th (09)/12th (08) | 9th (09)/14th (08) |
| 0-60/30-70mph | 6.0/5.4 secs | 6.4/7.0 secs | 6.4/6.1 secs |
| 30-50mph in 3rd/4th | 4.0/5.3 secs | 3.8/5.4 secs | 3.4/5.0 secs |
| 50-70mph in 5th/6th | 6.2/7.8 secs | 6.6/8.5 secs | 6.5/8.6 secs |
| Top speed/rpm at 70mph | 163mph/3,000rpm | 151mph/2,800rpm | 155mph/2,600rpm |
| Braking 70-0/60-0/30-0mph | 43.1/30.8/8.4m | 46.3/35.1/8.5m | 49.9/35.5/9.5m |
| Noise levels outside/idle/30/70mph | 55/47/62/73dB | 63/40/60/70dB | 58/43/61/70dB |
| Auto Express economy/range | 26.5mpg/373 miles | 31.3mpg/379 miles | 26.1mpg/402 miles |
| Govt urban/extra-urban/combined | 20.8/40.9/30.1mpg | 23.9/45.6/33.2mpg | 20.3/41.5/29.7mpg |
| Actual/claimed CO2/tax bracket | 246/221g/km/33% | 208/199g/km/27% | 250/220g/km/32% |
| Airbags/Isofix/parking sensors | Four/yes/£334 | Four/yes/£590 | Four/yes/£592 |
| Air-conditioning/metallic paint | Yes/£589 | Yes/ £510 | Yes/£607 |
| Auto box/stability/cruise control | £1,920/yes/£287 | £1,765/yes/£245 | £1,575/yes/yes |
| Leather/heated seats | £271/£589 | £1,015/£280 | £313/£607 |
| Sat-nav/aux-in/Bluetooth | £1,904/yes/£512 | £2,135/yes/£585 | £974/yes/yes |
| Xenon lights/folding hard-top | £1,016/no | Yes/yes | £714/yes |
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