You don't have to make calls to get the rate limit left, it comes in the API response HTTP header.
https://dev.twitter.com/docs/rate-limiting
Look for these headers:
X-FeatureRateLimit-Limit
X-FeatureRateLimit-Remaining
X-FeatureRateLimit-Reset
https://dev.twitter.com/docs/rate-limiting
Look for these headers:
X-FeatureRateLimit-Limit
X-FeatureRateLimit-Remaining
X-FeatureRateLimit-Reset
https://dev.twitter.com/docs/api/1.1/get/application/rate_li...