What is the oil to gas ratio for 4.5hp 2cycle engine? I know its 50-1 but how much oil do I put in 1 gal of gas? Thanks

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The easiest is to buy the 50:1 pre-mixed bottles. 1 bottle to 1 gal of gas. They are formulated for 2-cycle engines.

1/50 of a gal is about 0.02 gal is about 2.5 OZ

Actually it's 1/51 for 50:1 which will give the same result even closer to 2.5 OZ.