crossing
hey mike
fuelwise all is good travelling east to west as you are through Pozo Colorado, Filadelfia and up to Mariscal Estigarriba - these towns and points inbetween have random fuel stations. After the latter you will travel about 180kms ( if memory serves me well ) to a town (townland?) called Estancia La Patria. There isnt a petrol station here as such but if you ask around you will find what appears to be an abandoned gas station (roof gantry and all) that will probably be occupied by a load of  can drinking paraguayans sitting around in deckchairs ( lovely guys the day i was there ) with one guy who sells fuel out of drums for reasonable prices.
At this point you have the option of taking the newly finished perfect asphalt road southwest for Ivibobo- Villa Montes in Bolivia ( this new road is not on any map yet ) or the old trans chaco road northwest to Hito Villazon (paraguay border) and on to Boyuibe in Bolivia. I imagine the latter route is the one for you if heading to Ecuador via La Paz but as i have only travelled the former I cant vouch for fuel availability on this stretch. So make sure to fuelup in Estancia in the event of this route being similar to the southwest Ivibobo route I took ( 300kms more or less without a fuel stop of any kind).
Ask the guys at Estancia La Patria about your route northwest to Boyuibe in Bolivia - they will know the lie of the land
best of the luck
f
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