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The trip of tourist is${}^{\mathbf{750}\mathbf{}\mathbf{miles}}$(in the US).

Fuel consumption rate of the car is${}^{\mathbf{40}\mathbf{}\mathbf{gallons}\mathbf{}\mathbf{per}\mathbf{}\mathbf{mile}}$

$\mathbf{1}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{K}\mathbf{.}\mathbf{}\mathbf{gallon}\mathbf{=}\mathbf{4}\mathbf{.}\mathbf{5460900}\mathbf{}\mathbf{liters}$

$\mathbf{1}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{S}\mathbf{.}\mathbf{}\mathbf{gallon}\mathbf{=}\mathbf{3}\mathbf{.}\mathbf{7854118}\mathbf{}\mathbf{liters}$

In this problem the ratio of the 1 U.K. gallon and the 1 U.S. gallon can be found to measure the amount of fuel.

$\mathbf{1}\mathbf{U}\mathbf{.}\mathbf{K}\mathbf{.}\mathbf{}\mathbf{gallon}\mathbf{=}\mathbf{4}\mathbf{.}\mathbf{5460900}\mathbf{}\mathbf{liter}\mathbf{脳}\frac{\mathbf{1}\mathbf{U}\mathbf{.}\mathbf{S}\mathbf{.}\mathbf{}\mathbf{gallon}}{\mathbf{3}\mathbf{.}\mathbf{78}\mathbf{}\mathbf{liter}}$

$\mathbf{1}\mathbf{U}\mathbf{.}\mathbf{K}\mathbf{.}\mathbf{}\mathbf{gallon}\mathbf{}\mathbf{=}\mathbf{}\mathbf{1}\mathbf{.}\mathbf{2}\mathbf{}\mathbf{u}\mathbf{.}\mathbf{s}\mathbf{.}\mathbf{}\mathbf{gallon}$

Amount of fuel consumed by car for the trip is${}^{\left(\frac{\mathrm{Actual}\mathrm{distance}}{\mathrm{Fuel}\mathrm{consumption}\mathrm{rate}\mathrm{of}\mathrm{car}}\right)}$

The tourist travels${}^{\mathbf{750}\mathbf{}\mathbf{miles}}$by car that has fuel consumption capacity as${}^{\mathbf{40}\mathbf{}\mathbf{gallons}\mathbf{}\mathbf{per}\mathbf{}\mathbf{mile}\mathbf{}}$.

So, the amount of fuel that the tourist believes she needs is,

$$\begin{gathered} \frac{\mathbf{Actual}\mathbf{}\mathbf{distance}}{\mathbf{Fuel}\mathbf{}\mathbf{consumtion}\mathbf{}\mathbf{rate}\mathbf{}\mathbf{of}\mathbf{}\mathbf{cae}}\mathbf{=}\frac{\mathbf{750}}{\mathbf{40}} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{18}\mathbf{.}\mathbf{75}\mathbf{}\mathbf{gallon} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{18}\mathbf{.}\mathbf{8}\mathbf{}\mathbf{gallons}\mathbf{}\mathbf{(}\mathbf{In}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{K}\mathbf{.}\mathbf{)} \end{gathered}$$

As you know the relation between U.S. Gallon and U.K. Gallon, you can find the amount of fuel that the tourist actually requires for a trip in U.S Gallon.

$$\begin{gathered} \mathbf{1}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{K}\mathbf{.}\mathbf{}\mathbf{gallon}\mathbf{}\mathbf{=}\mathbf{}\mathbf{1}\mathbf{.}\mathbf{2}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{S}\mathbf{.}\mathbf{}\mathbf{Gallon} \\ \mathbf{18}\mathbf{.}\mathbf{75}\mathbf{}\mathbf{UK}\mathbf{}\mathbf{Gallon}\mathbf{}\mathbf{=}\mathbf{}\mathbf{18}\mathbf{.}\mathbf{75}\mathbf{}\mathbf{UK}\mathbf{}\mathbf{Gallon}\mathbf{脳}\frac{\mathbf{1}\mathbf{.}\mathbf{2}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{S}\mathbf{.}\mathbf{}\mathbf{Gallon}}{\mathbf{1}\mathbf{}\mathbf{}\mathbf{UK}\mathbf{}\mathbf{Gallon}} \\ \mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{=}\mathbf{22}\mathbf{.}\mathbf{5}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{S}\mathbf{.}\mathbf{}\mathbf{Gallons} \end{gathered}$$

Thus, the car actually takes ${}^{\mathbf{22}\mathbf{.}\mathbf{5}\mathbf{}\mathbf{U}\mathbf{.}\mathbf{S}\mathbf{.}\mathbf{}\mathbf{Gallons}}$.