TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Host: The fatty ester production host comprises a heterologous nucleic acid sequence encoding an ester synthase enzyme, so that the fatty ester production host produces at least two different fatty esters, and a heterologous nucleic acid sequence encoding a thioesterase enzyme; or the fatty ester production host comprises a nucleic acid sequence encoding a thioesterase enzyme, an acyl-CoA synthase enzyme and an ester synthase enzyme, and either lacks a nucleic acid sequence encoding for an acyl-CoA dehydrogenase enzyme or expresses an attenuated amount of an acyl-CoA dehydrogenase enzyme (preferably the fatty ester production host is a bacterium; especially Escherichia coli). The fatty ester production vessel comprises an Escherichia coli bacterium comprising a nucleic acid sequence encoding for at least one of thioesterase enzyme, acyl-CoA synthetase enzyme, and ester synthase enzyme.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method (M1) involves identifying a desired fatty ester composition, where the fatty ester composition comprises at least a first fatty ester of formula B1COOA1 and a second fatty ester of formula B2COOA2, where B1COOA1 is different from B2COOA2; selecting at least a first alcohol for an alcohol mixture, where the first alcohol and A1 have a same number of carbon atoms; selecting at least a second alcohol for the alcohol mixture, where the second alcohol and A2 have a same number of carbon atoms; providing the alcohol mixture to a fatty ester production host; and converting the alcohols of the alcohol mixture to a fatty ester composition using the fatty ester production host.B1 and B2= greater than or equal to 6C chain (preferably 6-30C chain, especially 10-30C chain);A1 and A2=1-5C alkyl (preferably 1-4C alkyl).In the method, the conversion efficiency of the alcohols to the fatty esters varies depending upon the alcohol. The step of selecting the alcohols involves providing a desired ratio of B1COOA1 to B2COOA2 in the fatty ester composition; estimating a ratio of the first alcohol to the second alcohol based upon the desired ratio of B1COOA1 to B2COOA2, where either the first or second alcohol is methanol; and reducing an amount of the methanol below the estimated ratio of the first alcohol to the second alcohol based upon the desired ratio of B1COOA1 to B2COOA2. In the step of providing greater than or equal to 2 different alcohols; at least methanol, or at least ethanol is provided. The method further involves administering a production substrate to the fatty ester production host, so that the production substrate is utilized by the fatty ester production host to produce additional fatty esters. The method (M1) involves:(1) method (A): providing a mixture comprising methanol and at least one different alcohol having a different number of carbon atoms from methanol, where the mixture substantially lacks propanol; and producing fatty esters by providing the mixture to a fatty ester production host;(2) method (B): selecting methanol as a first alcohol for an alcohol mixture; selecting a second alcohol for the alcohol mixture: providing the alcohol mixture to a fatty ester production host; and converting the alcohols of the alcohol mixture to a fatty ester composition using the fatty ester production host, so that the presence of methanol in the alcohol mixture results in a fatty ester of formula B1COOA1a, where the fatty ester composition is biased to include more fatty esters having B1 selected from 16C, 17C and/or 18C chain, in comparison to a method where the only alcohol is ethanol; or(3) method (C): selecting ethanol as a first alcohol for an alcohol mixture; selecting a second alcohol for the alcohol mixture; providing the alcohol mixture to a fatty ester production host; and converting the alcohol mixture to a fatty ester composition using the fatty ester production host, so that the presence of ethanol in the alcohol mixture results in a fatty ester of formula B1COOA1, where the fatty ester composition is biased to include more fatty esters having B1 selected from 12C, 13C and/or 14C chain, in comparison to a method where the only alcohol is methanol.A1a=1C alkyl.In the method (A), the total amount of fatty ester produced is greater than an amount of fatty ester that is produced when a same amount of the at least one different alcohol is provided, but methanol is not provided. The method (M1) further involves performing a separation process to extract the fatty esters from the product stream. Preferred Components: The at least one different alcohol of the method (A) is of formula R1OH.R1=1-18C alkyl.The alcohols used in the method (M1) are 1-5C alcohols. Preferred Composition: The fatty ester composition produced by the methods (B) and (C) comprises a second fatty ester of formula B2COOA2, where B1COOA1 is different from B2COOA2. The fatty esters produced by the production system include methyl ester, isopropanyl ester and propanyl ester. EXAMPLE - Fatty ester production by utilizing mixed alcohols, was carried out as follows. M9 minimal media (6 g/L Na2HPO4, 3 g/L KH2PO4, 0.5 g/L NaCl, 1 g/L NH4Cl, 1 mg/L thiamine, 1 mM MgSO4, 0.1 mM CaC12, 20 g/L glucose) productions were carried out using E. coli strain C41 (DE3 Delta fadE (acyl-CoA dehydrogenase)) carrying the plasmid pACYCop-adp1WS (where WS = ester synthase) under transcriptional control of the trc promoter (pTrcHisA2 plasmid) as the production host. Cells were cultured using the standard M9 fermentation protocol. A single colony or a scraping from a frozen glycerol stock was used to inoculate Luria bertani (LB) + appropriate antibiotics overnight pre-seed culture. Using a 1:100 dilution of the pre-seed culture, LB + antibiotics seed culture was inoculated. The seed culture was allowed to grow at 37 degrees C with shaking until OD600 was 1-2. The seed culture (2 ml) was then used to inoculate M9 media culture (20 ml) in 125 ml shake flask. These cultures were allowed to grow at 37 degrees C with shaking until the OD600 was 1 at which point the cells were induced with isopropyl- beta -D-thiogalactoside (IPTG) at final concentration of 1 mM and fed 2% final volume pure alcohol or a mixture of different alcohols; such as 2% final total volume of ethanol, a mixture of three alcohols (equal parts methanol, ethanol, isopropanol), or a mixture of four alcohols (equal parts methanol, ethanol, isopropanol, and propanol) at induction. The production host was allowed to process the alcohol(s) and media contents for an additional 20 hours post-induction at 30 degrees C before extracting with ethyl acetate. When analyzed by gas chromatography (GC)/mass spectroscopy (MS), the fatty esters corresponding to all four alcohols tested could be identified. The total titer of cultures fed with the 3-alcohol mixture (1156.84 mg/L) was higher than those fed only ethanol (945.34 mg/L). Cells fed all four alcohols had the lowest overall titer (670.09 mg/L). For both sets of cultures fed the alcohol mixtures, methyl esters were the most abundant fatty esters, followed by the ethyl esters or propyl esters. The results indicated that using a mixture of alcohols could boost the overall fatty ester titer over using ethanol alone (such as 1156.84 mg/L of total (for methanol, ethanol, and isopropyl alcohols) compared to (945.34 mg/L total (for ethanol alone)). In addition, the sum of the fatty acid methyl ester (FAME) and fatty acid ethyl ester (FAEE) titers was higher than the total FAEE titer for cells fed ethanol only (1079.11 mg/L versus 945.34 mg/L). Thus, it was apparent that the addition of methanol to fatty ester production process could result in synergistic and unexpected increase in the output of fatty esters. This also demonstrated the ability of production host to utilize alcohols other than ethanol to produce various fatty esters and to do so simultaneously.