Is there a way to test gas mileage with a broken odometer?

I have a 94 thunderbird, and it just seems to get TOO bad gas mileage. I put 8 gallons in, an its at least 3/4 gone after driving maybe 90 miles.Is there a way to test gas mileage with a broken odometer?
you cant really do that and be accurate about it unless the speedometer is working on it ,all you can do is guess at it,and you could be off 3-5 miles per gallon either way ,id suggest getting the speedometer repaired before i attempted to figure the mileage on it,good luck.
your welcome.

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Is there a way to test gas mileage with a broken odometer?
i wish gas prices can go down
look up map on where you drive count miles or use a gpsIs there a way to test gas mileage with a broken odometer?
that's almost 14 mpg.
Yep like J said...look at a map with a scale of mileage on it.