Not wrong.
Ratios will vary with the input plastic mix and the chosen output product.
Just as the price obtained per barrel will vary depending on the product, the time of year, and general market conditions.
That is why these things are called estimates, because all of the relevant variables can not be know in advance.
The data coming in the pending Q will be exact since it is data gathered based on what actually happened.
Prediction is very hard, especially about the future - Yogi Berra