I think I'm correct in saying...
The light on the dash goes off volume of liquid left in the tank so will come on when the physical amount of fuel reaches a set limit (although mine is sometimes slow to respond)
The Info display warning is based on your current average fuel consumption (which is taken over the last so many (15 I seem to remember but could be wrong) miles) so if you have been thrashing it like a rally driver for the past few miles it may tell you that three gallons will only get you 30 miles ... the dash light would then come on when you had say 10 miles left (would be one gallon in my example).
Hope this makes sense ... please note figures given are not exact but the manual should shed some light.
Dave
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