2008 Saab Aero 9-3 TTiD

The 9-3 Aero TTiD is a twin turbo model, with the "TT" moniker indicating the two turbo technology. As fuel - or rather its price - is such a hot topic at the moment, I was blown away by the superb economy that the diesel Aero delivered. Powered by a 1.9-litre turbo diesel that produces 132kW and 400Nm our test model was matched to the 6-speed manual transmission. Official fuel consumption figures indicate that this model would average 5.7-litres per 100kms. Often official figures are achieved in a rarefied environment that is difficult to match in everyday driving. Well in this case - and we're not holding back - I achieved a brilliant best highway economy of 4.5-litres/100kms and an average of 5.5-litres/ 100kms. Based on this consumption a range of 1,000 kms on a single tank would not be unusual. This is the first Saab diesel to sport the top of the range Aero badge.

It is offered only in one trim level with choice of automatic or manual. That a turbodiesel is offered in the sporty Aero model indicates that this is not an engine that was specifically designed for economy, but more with performance in mind, the superb economy being a welcome bonus.bSaab had earlier introduced a single turbo diesel - the TiD - and common rail direct injection make the twin turbo a superior unit. Its 400Nm output is significant, being only matched by the Saab limited edition Turbo Xturbocharged V6 petrol model. It generates 80Nm more than the single turbo TiD models. The two stage turbo charger housing is integrated with the exhaust manifold and contains two turbochargers of different sizes. The pair of turbine/compressor wheels are sequentially mounted and each is able to by-pass the input and output feeds of the other, while also being able to operate in tandem.

This arrangement provides a driver with the best of both worlds - good, instant torque at low engine speeds - via the low-inertia small turbo when the exhaust pressure is light - and strong 'top end' power at higher revolutions, when the larger turbo is engaged. In theory this is good, but in practice we are not fully convinced. The dual turbos can operate either individually or in tandem, helping to generate more power and torque by pushing more air into the engine's combustion chambers. From 1500rpm the smaller turbine generates boost, while between 1500 rpm and 3000 rpm both turbines spin. Above 3000 rpm only the larger turbo operates. The smaller turbo kicks in and helps avoid turbo lag, but anyone looking for great acceleration from this unit will be disappointed. At low speeds - say up to 25km/h - one needs a heavy foot and deft gear choice for a sporty feel.

As the dual turbos kick in, things liven up and there are genuine sporty aspirations. This is helped by the short throw 6-speed box, which is well matched to the engine, but it is always fighting a heavy machine that weighs in at 1round 1600kg. Nevertheless, it does a good job and performance is brisk and if I was buying the Aero, the manual puts forward a strong argument over the auto which for some reason produces 30Nm less than the manual powered TTiD. The 1.9-litre TTiD engine is the same as that used in the TiD, by Holden in the Astra and Alfa Romeo in the 147 and 159. Its output has been increased thanks to the twin turbos and larger intercooler. The profile of the TTiD Aero is appealing with great proportions, a beefy rear end - with dual chrome exhausts - and low side skirts. The rising lines to the C pillar give a hint at menace and alloy wheels scream performance! The overall look of the Aero is great with distinctive camshell bonnet and Saab grille. The grille is louvered and there are low set fog lights and black air inlet apron. Inside the Saab has all the equipment expected at the top end of the range.

The dash layout is perhaps a little tired, but is still functional although it is not in the same league as some competitors. It has a high, upright profile with controls easily laid out for accessibility, despite quirky air vent levers. Overall ambiance is one of relaxed comfort, rather than premium value, despite lashings of leather, charcoal colour scheme and subtle alloy accents. Seats are extremely comfortable, set low, and cocoon their occupants with support in all the right places. It is a seat that you can happily endure long sessions on the road. Side bolstering and contouring are first class, and there are 3 memory settings on the driver's seat. Standard equipment includes heated front seats, rain sensing wipers, automatic climate control and a night panel instrument setting that dims all instruments other than the speedo. The steering wheel is adjustable for reach and tilt and has an information scroll button, bluetooth phone connectivity on the left, while audio controls are located on the right hand side of the wheel.

Instrumentation includes a tachometer, speedo, temperature and an interesting turbo gauge, which indicates the air volume used for combustion. The information display is also comprehensive with displays of distance traveled, trip metres x 2, outside temperature, range until empty, average fuel consumption, average speed and a speed warning. There are parking sensors - no reversing camera - clock and cruise control. All TTiD models are fitted with dual stage front airbags, front head/thorax side airbags and full length side airbags, along with traction control and anti-lock brakes, with electronic brakeforce distribution, brake assist and cornering brake control. There is a driver's foot rest and a wide foot well. The combination of a low set seat and a high dash line would make forward visibility an issue for shorter drivers, but were fine for this 6 footer. Side mirrors are distorted and the A pillars impinge a little into the driver's view. The centre console is at perfect elbow height, and also has a 12volt plug inside.

There are cupholders, overhead vanity mirrors, map lights, and concealed ashtray and cigarette lighter. Unlike the front seats the back area is cramped and there is little knee room, especially if adults have to sit there. There are wide opening doors and at least access is good to the back seats. The boot however is of good size. The standard spare wheel is full size. On the road the TTiD is generally a great car to drive. The suspension is well sorted, ride and handling are difficult to fault and interior noise levels are acceptable. Performance is not earth shattering, but neither is it designed to be. It is brisk and the excellent fuel economy is sure to be a strong selling point.