what MPG can I expect from e.g. a 1.9 TD or 1.9TDi ?

[MacAoidh]

Gotcha!

Normal fuel consumption for 2100kg and 110km/h (70MPH) driving is
9.6L/100km or 24.5 US MPG / 29.5 Imp MPG and for constant 100km/h (65MPH)
driving 9.2L / 100km or 25.5 US MPG / 31 Imp MPG.

And he said it here: http://gerry.vanagon.com/cgi-bin/wa.exe ... &S=&P=2362

THE VEHICLE: 1989 Syncro TriStar
ENGINE: 1998 Jetta TDI, engine code AHU, stock power is 90hp and 149ft.lbs of torque.
ENGINE MODS: EGR removed to help stop manifold constipation. Larger custom injectors and custom ECU software designed with the heavier Vanagon in mind.
ENGINE POWER: around 135 to 140hp and around 240 to 250ft.lbs of torque.
TRANSMISSION: 3rd gear is 1.17, 4th gear is 0.77, stock 4.86:1 final drive
TIRES: Continental Sportiva AT 225/75R16 (29.2" tall)
RPM at 100km/h: 2700

[lloyd]

http://www.brick-yard.co.uk/forum/forum ... &KW=1%2E9d

Seach is your buddy

[HarryMann]

wind drag. I've always wondered how significant it is at different speeds..

Very when cruising, going up with the square of the speed. So at 60mph its 4x what it is at 30, and at 90 9x what it is at 30mph...

Over 50 its dominating the drag, and at 70 its easily the major factor, which is why small cruising speed increases or slight winds (not felt), even cross-winds which ramp up the drag coefficient, make such a big difference to consumption.

That David Marshall link is a good one, in short saying that with very highly developed Tdi installation, you should expect about 30 mpg motorway cruising consumption.

i.e. 65 to 70 increases consumption from 31mpg to 29.5 mpg (7.5% increase in speed increases consumption 5%, but would then progressively get much worse I imagine)

[MacAoidh]

Thanks all, much appreciated.