Preparation and optimization of oxygenated gasolines

A method to control an xBOB output stream, which comprises:

• (a) spectroscopically analyzing an xBOB stream to produce spectrum of said analyzed xBOB product;
• (b) correcting said spectrum mathematically to produce a corrected spectra;
• (c) applying a calibration model to said corrected spectra;
• (d) obtaining predicted laboratory results from said calibration model;
• (e) transferring said predicted laboratory results to a control system;
• and
• (f) modifying the ratio of blendstock components of said xBOB stream based on said results to produce an xBOB output stream that when said xBOB stream is combined with a fixed, known quantity of a predetermined oxygenate will produce an oxygenate-containing gasoline product having preset physical properties,
• wherein the xBOB stream is a hydrocarbon blendstock prior to a product terminal.