I'm researching deeper, but with 1.72 I get:

remaining calls 4364
about to look up repo EVCache
2016-06-28 21:28:20 INFO GithubAccess:53 - repo = EVCache, forks = 82, stars = 314
2016-06-28 21:28:20 DEBUG GithubAccess:56 - openIssues = 0, openPullRequests = 0
2016-06-28 21:28:22 DEBUG GithubAccess:107 - daysSinceLastCommit = 0
2016-06-28 21:28:23 DEBUG GithubAccess:111 - numContribitors = 16, contributorEmails = ArrayBuffer(smadappa, senugula, jkschneider, vuzilla, ScottMansfield, rspieldenner, elandau, gitter-badger, rdegnan, nadavc, aspyker, trigan-d, pauloricardomg, kedargsm, quidryan, Randgalt)
2016-06-28 21:28:24 DEBUG GithubAccess:146 - avg days to close 14 issues = 357 days
2016-06-28 21:28:24 DEBUG GithubAccess:128 - avg days to close 13 pull requests = 185 days
2016-06-28 21:28:24 DEBUG GithubAccess:96 - repo json = {"asOfISO":"2016-06-29T04:27:43Z","asOfYYYYMMDD":"2016-06-29","repo_name":"EVCache","public":true,"osslifecycle":"UNKNOWN","forks":82,"stars":314,"numContributors":16,"issues":{"openCount":0,"closedCount":14,"avgTimeToCloseInDays":357},"pullRequests":{"openCount":0,"closedCount":13,"avgTimeToCloseInDays":185},"commits":{"daysSinceLastCommit":0},"contributors":["smadappa","senugula","jkschneider","vuzilla","ScottMansfield","rspieldenner","elandau","gitter-badger","rdegnan","nadavc","aspyker","trigan-d","pauloricardomg","kedargsm","quidryan","Randgalt"]}
remaining calls 4341

resulting in 23 API calls

with 1.76, I get:

remaining calls 4640
about to look up repo EVCache
2016-06-28 21:22:22 INFO GithubAccess:53 - repo = EVCache, forks = 82, stars = 314
2016-06-28 21:22:22 DEBUG GithubAccess:56 - openIssues = 0, openPullRequests = 0
2016-06-28 21:23:01 DEBUG GithubAccess:107 - daysSinceLastCommit = 0
2016-06-28 21:23:03 DEBUG GithubAccess:111 - numContribitors = 16, contributorEmails = ArrayBuffer(smadappa, senugula, jkschneider, vuzilla, ScottMansfield, rspieldenner, elandau, gitter-badger, rdegnan, nadavc, aspyker, trigan-d, pauloricardomg, kedargsm, quidryan, Randgalt)
2016-06-28 21:23:04 DEBUG GithubAccess:146 - avg days to close 14 issues = 357 days
2016-06-28 21:23:04 DEBUG GithubAccess:128 - avg days to close 13 pull requests = 185 days
2016-06-28 21:23:04 DEBUG GithubAccess:96 - repo json = {"asOfISO":"2016-06-29T04:20:26Z","asOfYYYYMMDD":"2016-06-29","repo_name":"EVCache","public":true,"osslifecycle":"UNKNOWN","forks":82,"stars":314,"numContributors":16,"issues":{"openCount":0,"closedCount":14,"avgTimeToCloseInDays":357},"pullRequests":{"openCount":0,"closedCount":13,"avgTimeToCloseInDays":185},"commits":{"daysSinceLastCommit":0},"contributors":["smadappa","senugula","jkschneider","vuzilla","ScottMansfield","rspieldenner","elandau","gitter-badger","rdegnan","nadavc","aspyker","trigan-d","pauloricardomg","kedargsm","quidryan","Randgalt"]}
remaining calls 4409

resulting in 231 API calls

This is running this code:

https://github.com/Netflix/osstracker/blob/master/osstracker-scraper/src/main/scala/com/netflix/oss/tools/osstrackerscraper/GithubAccess.scala#L52