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Old 01-05-2015, 12:56 PM   #3 (permalink)
Vekke
Master EcoModder
 
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Join Date: Jan 2009
Location: Kitee (Finland)
Posts: 966

Siitin - '98 Seat Cordoba Vario
90 day: 58.56 mpg (US)

VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L
Diesel
90 day: 104.94 mpg (US)

A8 luxury fuel sipper - '97 Audi A8 1.2 TDI 6 speed manual
90 day: 64.64 mpg (US)

Audi A4B6 Avant Niistäjä - '02 Audi A4b6 1.9tdi 96kW 3L
90 day: 54.57 mpg (US)

Tourekki - '04 VW Touareg 2.5TDI R5 6 speed manual
Last 3: 24.55 mpg (US)

A2 1.4TDI - '03 Audi A2 1.4 TDI
90 day: 45.68 mpg (US)
Thanks: 166
Thanked 481 Times in 205 Posts
Here is one constant power curve for 1.2 TDI with some reference points on my Audi A8 project with vaious gear and Cd ratios.


You can clearly see that if you just lower your drag your engine efficiency will get worse. that is the reason why you should always match your gear ratios when you lower your drag figures.
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Less drag = Less fuel
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