The question, as stated, cannot be answered sensibly. A fluid ounce is a measure of volume, with dimensions [L3]. A milligram is a measure of mass, with dimensions [M]. The two measure different things and elementary dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a fl oz of air and of water. They will have very different masses.
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none, there would be 240 milliliters, not milligrams
fuel = 2 miles / (25 miles/gal) = 2/25 gal = 0.08 gal 1 gal = 8 pint → 2/25 gal = 2/25 × 8 pint = 16/25 pint = 0.64 pint As you use the word "gas" instead of "petrol", I will assume you are American: 1 pt = 16 fl oz → 16/25 pt = 16/25 × 16 fl oz = 10 6/25 fl oz = 10.24 fl oz (just under 10¼ fl oz).
800 ml = 27.051 fl oz (US) / 28.156 fl oz (UK)
1 US fl. oz. equals 29.5735 ml (milliliter).
16 oz is 2 cups