The table shows the gas mileages (in miles per gallon) of eight cars with and without using a fuel additive. At \(\alpha=0.10\), is there enough evidence to conclude that the additive improved gas mileage? Assume the populations are normally distributed.

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Car 1 2 3 4 24.3 Gas mileage (without fuel additive) 23.1 25.4 21.9 Gas mileage (with fuel additive) 23.6 27.7 23.6 26.8 Car 5 6 7 8 Gas mileage (without fuel additive) 19.9 21.2 25.9 24.8 Gas mileage (with fuel additive) 22.1 22.4 26.3 26.6