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Discussion Starter #1
I'd settle for a 2 door with start/stop.

http://green.autoblog.com/2009/12/30/new-99-g-km-audi-1-6-tdi-now-available-for-order-in-the-uk/

EMISSIONS TUMBLE TO 99 GRAMS IN NEW AUDI A3 TDI

Aerodynamic measures and optimised TDI unit combine to deliver even more exceptional economy and emissions figures

* New ultra-economical, ultra-low CO2 version of A3 1.6 TDI significantly undercuts the original 1.9 TDIe on emissions and boosts economy thanks to advanced common rail fuel injection, start-stop and recuperation, combined with aerodynamic modifications
* Available in three-door form with five-speed manual transmission only, and in Standard trim only, priced at £18,005 OTR
* Turbocharged diesel features high pressure common rail injection and delivers up to 74.3mpg with CO2 output of 99g/km (0-62mph in 11.4 seconds, top speed 121mph)
* Revised final drive ratio, low rolling resistance tyres, slightly lowered ride height and modified under-body aid streamlining for optimum efficiency

A new, ultra-efficient version of the Audi A3 1.6 TDI - already the most economical premium sector car with the lowest CO2 output - is available to order from this week, extending the compact hatchback's lead by paring back CO2 output even further to just 99g/km and boosting combined economy to up to 74.3mpg. This exceptional frugality is available in one specific A3 configuration – the three-door body style equipped to Standard specification – priced at £18,005 OTR. All other variations of the 1.6 TDI continue to offer the class-leading combination of 68.9mpg potential and 109g/km CO2 output.

The key elements responsible for the efficiency gains in the most focused 1.6 TDI to date include a modified final drive ratio for the standard five-speed manual transmission, a reduced ride height, under-body revisions to reduce aerodynamic drag and the use of slightly smaller 15-inch alloy wheels shod with low rolling resistance tyres.

These small but significant alterations combine with existing A3 1.6 TDI features including engine start-stop and energy recuperation systems. The start-stop system conserves fuel by cutting engine power at idle when the clutch pedal is released and the gear lever is in its neutral position, and then restarting when the clutch is depressed, while the recuperation function recycles a proportion of the wasted kinetic energy generated under normal braking and normally dissipated as heat, and stores this temporarily in the battery to reduce engine load when the car subsequently accelerates again.

Despite its remarkable combined economy figure of 74.3mpg and its road tax eliminating 99g/km CO2 output, the A3 1.6 TDI can draw on the same 105PS power output and 250Nm torque peak as all other versions, and consequently can match them on performance, clearing 62mph from rest in 11.4 seconds and offering the option to continue to 121mph where conditions allow.

The A3 1.6 TDI with 99g output will be available exclusively in Standard specification, which in this specific case includes 15-inch 7-arm design alloy wheels (normally 16-inch 7-arm design), manual air conditioning, remote central locking, electric front windows and a Chorus radio with single CD player. Versions equipped to SE, Sport and S line specification, and all Sportback models, continue to offer the class-leading 109g/km output and the potential to cover up to 68.9mpg (except the A3 Sportback 1.6 TDI S tronic with 112g/km output and 65.7mpg).

These efficiency standard bearers are far from the exception to the rule for Audi. The Vorsprung durch Technik brand offers an exceptional range of models that champion the cause, the most notable being the A4 TDIe Saloon with emissions of 120g/km and 61.4mpg capability, the A6 TDIe with 53.3mpg and 139g/km and the TT TDI quattro with 53.3mpg and 139g/km. In 2010, another highlight will be launched in the shape of the all-new A8 luxury saloon, which in 3.0-litre TDI 204PS form will deliver another class best with the potential to cover up to 47.1mpg while emitting just 159g/km of CO2.
 

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This would eat into Golf sales. This has some weird features. It sounds like a base model. 15 inch wheels, single CD player, manual AC. Then it has start-stop and energy recovery I'm guessing at the alternator. Then it is lowered - these cars are so low how can they go lower without hitting every single speedbump? The under body panels seem like a good idea. If the A3 has the same basic configuration, I wonder if they will fit onto a Jetta or Golf?
 

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It doesn't say exactly what under body difference it has, it just says "under-body revisions to reduce aerodynamic drag " and "modified under-body aid streamlining ". That could mean the splash shield has a few less grooves or no brake cooling ducts.
 

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It would cost too muc to modify the body so it must be something easy to change like the splash shield or something. Maybe there is an extra on on the front and back to cover the muffler tunnel and suspension.
 

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This would eat into Golf sales. This has some weird features. It sounds like a base model. 15 inch wheels, single CD player, manual AC. Then it has start-stop and energy recovery I'm guessing at the alternator. Then it is lowered - these cars are so low how can they go lower without hitting every single speedbump? The under body panels seem like a good idea. If the A3 has the same basic configuration, I wonder if they will fit onto a Jetta or Golf?
I don't think so. The Golf and Audi A3 are at different price ranges. Even in 2 door this would be a few thousand more.
 

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Discussion Starter #6
I don't think a little bit of tweaking to the underbody will result in a huge change. The low resistance tires, start/stop, smaller engines, and taller gearing seems more important.
 

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I think they underestimate how well a car like this will sell. People have forgotten 1-2 years ago when SUVs were being dumped. Oil is on it's way back up.
 
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