You need to factor in the rolling radius of the tires.  www.tirerack.com has
good data and the calculator at the bottom of this page is the most accurate
one i have found:
http://brickwerks.hostinguk.com/VehicleSpecific/T3/info/mods/alloys/altwhls.htm

On Fri, Apr 2, 2010 at 5:27 AM, Chris S <szpejankowski@gmail.com> wrote:

> I thought maybe someone here may have experience with a Eurovan and would
> be
> able to answer this.
>
> Friend just bought a 2003 Eurovan Weekender pop-top.  What kind of engine
> RPM should he expect while cruising at 70mph?  This is the 201hp VR6 with
> automagic transmission.
>
> I did calculations based on gear and final drive ratios, but either the
> figures I have are off, or his speedometer is off.
>
> 1st gear � 2.71     38.1 mph
>
> 2nd gear � 1.55    66.6 mph
>
> 3rd gear � 1.00    103.2 mph
>
> 4th gear - .68       151.8 mph
>
> Final drive  - 4.91
>
>
>
>
>
> Cruising speed/RPM:
>
>
>
> 60 mph � 2530 RPM
>
> 70 mph � 2952 RPM
>
> 75 mph � 3163 RPM
>
> 80 mph � 3373 RPM
>
>
> --
> Chris S.
> "No solution is too complex to be executed incorrectly"
>

-- 
Jake

1984 Vanagon GL
1986 Westy Weekender "Dixie"

Crescent Beach, BC

www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27