SUN's Speculative Grade Liquidity (SGL) rating remains SGL-2. The outlook is stable."The upgrade reflects Sunoco's ability to grow margins and EBITDA by wringing costs out of its business, despite pandemic-driven demand declines for gasoline and diesel in 2020 and only partial recovery in 2021," said John Thieroff, Moody's analyst. "These improvements and continued volume growth have allowed SUN to reduce debt leverage to about 4.5x on a Moody's-adjusted basis, a level we believe is sustainable and consistent with the Ba2 CFR."Upgrades:..Issuer: Sunoco LP.... Corporate Family Rating, Upgraded to Ba2 from Ba3.... Probability of Default Rating, Upgraded to Ba2-PD from Ba3-PD....