gasolines according to the present invention than with the other gasolines co emissions u2014 values presented in fig2 show that compared to carb ii the carbon monoxide emissions are lower for five vehicles for carb iii ioe whereas they are somewhat higher for iso okte this confirms that the effect of oxygen in gasoline can be significant when reducing co emissions especially in vehicles without closed loop fuel control systems no x emissions u2014 generally gasoline with oxygenates slightly increases no x emissions and this was also found to be the case in this study but lower for the gasolines according to the present invention compared to carb ii with all cars tested co 2 emissions and fuel consumption u2014 the carbon dioxide emissions and gasoline consumption of the test vehicles are presented in fig4 and 7 co 2 emissions from all the gasolines are almost equal and the possible differences are within the confidence interval all the differences fall within the confidence interval fuel consumption for the fuels with no oxygenates were lower than with oxygenates as expected non controlled emissions u2014 with the two test cars e and f also the amount of so called non controlled exhaust emissions were measured fig8 to 13 from the figures can be seen that the results are more depending on the car measured than on the fuel tested and no big differences cannot be seen particulate mass emissions u2014 the average particulate mass emissions at 22 u00b0 c with the two fuels and all vehicles are given in fig6 results are presented as average values.