That sounds pretty good for a Gasser! I know that with my 215/75/15 bfg all
terrains my speedo matches GPS until 40-50 mph then my speedo falls behind.
I've noticed that the more I drive her the closer the speedo matches the
GPS. Is was 5+ off over 50 now it's closer to 2-3 off. I have a turbo
diesel so my mileage differs, 26-28 mpg and almost 20 pulling a Lund 1650
explorer
On Sep 12, 2015 8:34 AM, "Dennis Haynes" <d23haynes57@hotmail.com> wrote:

> With that size tire you should do a speedometer comparison to a GPS to see
> where you really are. That is  a large tire. Between the oversize tires and
> slight bump in HP with the engine monitoring the transmission temperature
> is
> a good idea. I have seen that tire size on the automatics cause just enough
> continuous torque converter slip to heat things up and cause failures. If
> you really doing 20 mpg indicated and especially if you actually traveling
> further you are doing well.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Stan Shapiro
> Sent: Thursday, September 10, 2015 10:52 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Highway driving
>
> A newbie question to you all--
>
>
>
> I have a 2.2 WBX gowesty engine, 1990 Westy, Automatic,  with Generat AT2
> Grabber 215/65/16  at 44 pounds
>
> I usually highway drive at 63 mph, 3400 RPM, and average about 20 MPG.
> Is
> that about right?
>
>
>
> What highway speed / RPM  do most of you drive at?   What is your MPG?
>
>
>
>
>
> Thanks
>
> Stan Shapiro
>