Um, if the on-board computer is functioning, it's fairly simple. Hopefully. Push the turn signal stalk in toward the steering column. A display should appear or be present in the speedometer housing. Each push of the turn signal stalk "in" toward the steering column will pull up info on various computer function. One should be "range." Follow these instructions and the computer should be able to estimate your "range" in miles just after filling the tank. Could always read the owners manual too, if it's still with the car. Cheers matey.
About 4.4 miles per liter.
You did not list which model Mazda or which engine. However all of these 4 cylinder Mazda engines have a cam belt that should be replaced every 60,000 miles or 10 years whichever comes first. 1.6 Liter 1.8 Liter 2.0 Liter The 2.3 Liter V6 also has a belt that should be replaced at 60,000 miles. The 2.5 Liter V6 has a belt that should be replaced at 105,000 miles. None of these are interference engines but if the belt breaks you will have to have the car towed and you will be stranded.
mpg x 0.2642 = miles per liter
Use this formula: mpg x 0.2642 = miles per liter
28 mpg = 7.4 miles per liter
Should be changed around every 100,000 miles.
30 miles per gallon equates to about 7.925 miles per liter of gasoline.
Mine gets about 15 to 17 with the 3.2 liter
According to the owners manual the timing belt should be replaced at 90,000 miles (schedule A) for the 3.5 liter engine
6 mpg = 1.585 miles per liter.
3.785 is the conversion factor. So, miles per liter x 3.785 = mpg
30 mpg is 7.925 miles per liter