Facts and figures
| Mercedes SLK 250 CDI | Audi TT 2.0 TDI quattro | |
| On-the-road price/total as tested | £36,255/£43,805 | £30,300/£36,240 |
| Residual value (after 3yrs/30,000) | £20,992/57.9% | £17,453/57.6% |
| Depreciation | £15,263 | £12,847 |
| Annual tax liability std/higher rate | £1,443/£2,886 | £1,325/£2,650 |
| Annual fuel cost (12,000/20,000 miles) | £1,830/£3,050 | £2,092/£3,487 |
| Ins group/quote/road tax band/cost | 43/£561/E/£120 | 32/£492/F/£135 |
| Cost of 1st/2nd/3rd service | N/A | N/A |
| Length/wheelbase | 4,134/2,430mm | 4,187/2,468mm |
| Height/width | 1,301/1,810mm | 1,358/1,842mm |
| Engine | 4cyl in-line/2,143cc | 4cyl in-line/1,968cc |
| Peak power | 201/4,200 bhp/rpm | 168/4,200 bhp/rpm |
| Peak torque | 500/1,600 Nm/rpm | 350/1,750 Nm/rpm |
| Transmission | 7-spd auto/rwd | 6-spd manual/fwd |
| Fuel tank capacity/spare wheel | 60 litres/sp. saver | 60 litres/foam |
| Boot capacity (seats up/down) | 225/335 litres | 250/250 litres |
| Kerbweight/payload/towing weight | 1,590/315kg | 1,430/320kg |
| Turning circle/drag coefficient | 10.5 metres/0.30Cd | 10.9 metres/0.34Cd |
| Basic warranty (miles)/recovery | 3yrs (unltd)/4yrs | 3yrs (60,000)/3yrs |
| Service intervals/UK dealers | Variable/136 | Variable/135 |
| Driver Power manufacturer/dealer pos. | 8th/10th | 11th/18th |
| Euro NCAP: Adult/child/ped./points | N/A | N/A |
| 0-60/30-70mph | 6.7/6.6 secs | 8.3/8.5 secs |
| 30-50mph in 3rd/4th | 2.7/3.2 secs | 3.5/5.2 secs |
| 50-70mph in 5th/6th | 5.1/6.8 secs | 6.6/8.4 secs |
| Top speed/rpm at 70mph | 151mph/1,750rpm | 139mph/2,050rpm |
| Braking 70-0/60-0/30-0mph | 46.3/34.1/9.2m | 48.1/34.6/8.5m |
| Noise levels outside/idle/30/70mph | 63/45/59/68dB | 65/48/60/69dB |
| Auto Express econ. (mpg/mpl)/range | 43.1/9.5/569 miles | 37.7/8.3/498 miles |
| Govt urban/extra-urban/combined | 45.6/65.7/56.5mpg | 39.2/62.8/51.4mpg |
| Govt urban/extra-urban/combined | 10.3/14.5/12.4mpl | 8.8/13.0/11.1mpl |
| Actual/claimed CO2/tax bracket | 176/132g/km/20% | 201/144g/km/22% |
| Airbags/ISOFIX/rear parking sensors | Six/yes/£680* | Four/yes/£305 |
| Air-conditioning/leather/heated seats | £495/yes/£330 | Yes/yes/£255 |
| Auto gearbox/stability/cruise control | Yes/yes/yes | £1,480/yes/£220 |
| Metallic paint/xenons/windbreak | £645/£1,115/yes | £510/£995/yes |
| Sat-nav/USB/Bluetooth | £1,995*/yes/yes | £665/£185/£250 |
