I agree with the folks like CSMRetired and accumack. Our Legacy has a 90 gal tank and I believe I had about 30 gal left last time the low fuel indicator came on. I would rather have it reminding me it's close to the generator cutoff level than the tank empty level as we run the generator most of the time while on the road (summer travels in the south!). The low fuel lights in our vehicles come on at about 1/8 of a tank, but then they actually have about 1/8 of a tank in them when they indicate completely empty, too. That, though, is like a pay bonus - don't spend it just because you think it's coming!
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!