GR, there is NO ripio down to el calafate that you can't avoid. BUT the little there is ( eg close to LONDRES about 50kms) is easy; and the road is worth it.
At San Blas go to Tinogasta and on to paso San Francisco....and back, sleep at Cortaderas. (you'll thank me for that one)
Forget the ripio..and buy a map at the first news agent in argentina, eg Firestone; because the maps you are using must be really old or lacking detail
route 25 and 26 are across country roads to use if you happen to want to accros country. 25 is nice, 26 uglyish
best
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