started to do some research on this aspen alkylate fuel . alkylate petrol consist almost entirely of alkanes . the most important source of alkanes is natural gas and crude oil . alkanes are seperated in an oil refinery by fractional distillation and processed into many different products . alkylate replacing conventionel petrol does not decrease the total hydrocarbon emissions , but less hazardous hydrocarbons are emitted . cost 1.5 -3 times the cost of conventionel petrol . major advantages of alkylate petrol were found to be low proportions of benzene , alkybenzenes , and alkenes in the fuel . aspen 2 and aspen 4 contain virtually no harmful substances such as benzene , aromatic hydrocarbon , polyaromatic hydrocarbons , or olefins . ordinary petrol contains around one hundred substances including these harmful substances , but aspen alkylate petrol has around ten of these substances . all hydrocarbons emitted from the use of petrol are hazardous to human health and the enviroment but to a different extent for individual compounds . needless to say it may be better in many ways then conventionel petrol but it still is poison . just not as much as regular petrol . also the refining process of alkylate petrol also pollutes . there are many pros and cons to using the conventionel and non conventionel fuels . i guess only time will tell . peace !