Actually its more like 10+% with those tires,
I have the same rubber size and ran them on my 85 1.9 and now on my Syncro.
Same RPM before at 60 now indicates around 52-53 mph over 10% difference.
The 215 / 75/ 15 is significant, you can feel it in the gears for sure.

Doug

----- Original Message -----
From: "Dennis Haynes" <dhaynes@OPTONLINE.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, March 05, 2004 5:19 PM
Subject: Re: friday...whats the FASTEST youve driven in your vanagon????

> Didn't know what tires you were running. That is why I said "If". Even a
> 1.9L running right will easily do 85 on the level. That size tire
> probably puts the speedo where it belongs or only off by 1 or 2%. See my
> earlier post.
>
> Dennis
>
> -----Original Message-----
> From: JordanVw@aol.com [mailto:JordanVw@aol.com]
> Sent: Friday, March 05, 2004 7:21 PM
> To: dhaynes@optonline.net; vanagon@GERRY.VANAGON.COM
> Subject: Re: friday...whats the FASTEST youve driven in your vanagon????
>
> In a message dated 3/5/04 6:51:20 PM Eastern Standard Time,
> dhaynes@optonline.net writes:
>
>
>
>
> If you are running stock size tires, after you take out the speedo
> error, you were only dong about 85. The rated max/cruising speed.
>
> Dennis
>
>
> ok, math time here :<) my tires are 215/75/15's.  wouldnt that mean id
> actually be going faster than what my speedo says? and if you factor in
> the error, then it evens out to about what the speedo says..right?  i
> flunked algebra, dont ask me.. :<)   all i know is that i was passing
> just about everyone. .. and on I-78 people fly..
>
> chris