RIO DE JANEIRO & NEW YORK--(BUSINESS WIRE)--Fitch Ratings has assigned a Long-Term Issuer Default Rating (IDR) of 'BBB-' and a National Scale long-term rating of 'AA+(bra)' to Companhia de Gas de Sao Paulo (Comgas). The Rating Outlook is Stable. KEY RATING DRIVERS Comgas' ratings reflect the sound fundamentals of its natural gas distribution business and track record of robust financial profile, supported by reduced leverage, strong liquidity and relevant cash flow from operations (CFFO). Comga