I reset the trip odo every time I fill up. My 07 LS sedan gets about 300 mi. per tank. I usually refill at about 250. My Low Fuel light works fine. I think it has come on three times since I got the car. When I see it, I fill up immediately and give myself a good slap for neglecting it. I rarely let it go below 1/4 full.
mine comes on when the needle just touch the red line,
first it dim and turns on and off sometimes,
and then after a couple more kms it stays on,,
and it costs me ~$50 to fill it up,,, @ $1.35 / liter.
the geo metro has better mpg, but it kills your shoulders no p/s)
here is when did mine fuel light turns on.
just before completely match the red "E" line
yes the light turned on, but turned off immediately, need to drive a couple more km to make it stays on
just to let you know when will it start