Drop bike and pull muscle picking it up

I arrive at Oaxaca about 1030 hrs and stop by the side of the road to read the map and immediately drop the bike onto the pavement.  I manage to just pick it up just before some one comes to my aid.  Locals are so friendly and helpful where I have been.  On picking up the bike I strain my inside groin leg muscle and its quite sore.  Next stop is Oaxaca airport which is well signposted and 25kms out of town on a brand new fast road.  I manage to find an English speaking Aduna lady but there is no main office and the airport is a brand new International airport but has no Aduna office, I am told by my Aduna  lady that I will have to go back to my entry state (Chiapas) and get a temporary bike import document there.  She can not believe I have come so far without the correct bike documents and so comes out to see the bike and is most interested in it and the number plate!  I finally leave the airport and am wished good luck as we agree it is impractical to go back now to Chiapas and I head for a toll road (Autopiste) to Puebla.

Puelba is about 400 kms on very fast toll road (120kph) with a legal speed limit of 110kph but single lane with a good hard shoulder, up over the mountains again.  the road is more like a motorway with very few turning on or off.  The tolls cost me US$30 to Puebla and today I use lots of petrol.  I have spent in excess of US$100 each day for the last 4 days as I have covered a lot of miles, used toll roads and therefore used a lot of petrol (Daily - accommodation US$20, all food US$10, petrol US$70).