BMW Z4 vs rivals - specifications

 Porsche BoxsterBMW Z4 sDrive23iMercedes 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/quote43/£76540/N/A42/£514
Road tax band/costK/£215J/£215K/£215
Cost of 1st/2nd/3rd service£438/£577/£438£885 (5yrs inclusive)£229/£329/£229
Engine6cyl boxer/2,893cc6cyl in-line/2,497cc6cyl V6/2,996cc
Peak power 251/7,200 bhp/rpm201/6,400 bhp/rpm227/6,000 bhp/rpm
Peak torque 290/4,400 Nm/rpm250/2,750 Nm/rpm300/2,500 Nm/rpm
Transmission 6-spd man/rwd6-spd man/rwd6-spd man/rwd
Fuel tank capacity/spare wheel64litres/foam sealant55 litres/run-flats70 litres/space saver
Boot capacity (roof up/down) 280/280 litres*310/180 litres300/208 litres
Turning circle/drag coefficient11.1 metres/0.29Cd10.7 metres/0.34Cd10.5 metres/N/A
Basic warranty (miles)/recovery2yrs (unltd)/2yrs3yrs (unltd)/3yrs3yrs (unltd)/4yrs
Service intervals/UK dealers20,000 miles/34Variable miles/22315,000 miles/136
Driver Power maker/dealer pos.3rd (09)/5th (08)8th (09)/12th (08)9th (09)/14th (08)
0-60/30-70mph6.0/5.4 secs6.4/7.0 secs6.4/6.1 secs
30-50mph in 3rd/4th 4.0/5.3 secs3.8/5.4 secs3.4/5.0 secs
50-70mph in 5th/6th 6.2/7.8 secs6.6/8.5 secs6.5/8.6 secs
Top speed/rpm at 70mph 163mph/3,000rpm151mph/2,800rpm155mph/2,600rpm
Braking 70-0/60-0/30-0mph 43.1/30.8/8.4m46.3/35.1/8.5m49.9/35.5/9.5m
Noise levels outside/idle/30/70mph55/47/62/73dB63/40/60/70dB58/43/61/70dB
Auto Express economy/range26.5mpg/373 miles31.3mpg/379 miles26.1mpg/402 miles
Govt urban/extra-urban/combined 20.8/40.9/30.1mpg23.9/45.6/33.2mpg20.3/41.5/29.7mpg
Actual/claimed CO2/tax bracket246/221g/km/33%208/199g/km/27%250/220g/km/32%
Airbags/Isofix/parking sensorsFour/yes/£334Four/yes/£590Four/yes/£592
Air-conditioning/metallic paintYes/£589Yes/ £510Yes/£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
Xenon lights/folding hard-top£1,016/noYes/yes£714/yes

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