best tow speed?

Friends,

I'm about to start a summer of various length trips with our 178, and I hoped to learn from the accumulated experience of the group on best towing speed.  We'll tow with an Audi Q7 SUV, which has 6600 # tow capacity and 660 # tongue weight allowance.  The 3.0 liter diesel has plenty of torque and power and bears the weight of my precious golf clubs in an appropriately tender manner.  Current experience is 26 mpg without Our-pod and about 17 mpg with the little darling hooked through an Equalizer WDH.  We'll be well under the rating of the tow vehicle.

What do all y'all (Southern plural) think about the best speed?

Thanks much, Jim

Leo, thanks for your reply.  Was that best in terms of MPG, towing experience, sway, happy family, etc.?  I'm thinking there is this infinite combination of factors that lead to "best speed," and hoped to hear about the experience to see where it all sorts out.

again, thanks!  Jim

I like 60 also. 

In some states 55 is the max if you're towing a trailer.  When I'm on the interstate, I like to go just above 60.  The speed limit for cars is 70, 60 for trucks.  That way I'm not being passed by the semi's, and the cars that want to go fast can go around me.  On any given day I rarely drive over 300 miles anyway, so a little faster isn't really saving any time.  And of course anything over about 55, your MPG drops way off.

Thanks to all for the comments. 

I hadn't thought about max speed limits for towing.  However, on reviewing the latest NHTSA publication on state speed limits, I can't find any reference to travel trailers.  Lots of restrictions on mobile homes (also named as house trailers) and wide/ oversize trailers, but nothing that seems to refer to R-pods. 

I appreciate Podster's comments on the tires;  I'm going to go check mine right now!  

Best, Jim