26 miles isn't bad for the low fuel light. That is almost assuredly enough distance to get you to a gas station.
On my Sportster the light comes on with a gallon left and on the highway that equals about 48 miles in fuel conservation mode..... and I've run out at the pump. There are lots of highways in the West where gas stations are far enough apart that you can get in serious trouble if you happend to pass the very last one as they can be 100 miles apart.
26 miles isn't very far really and I'd like to know that I could have a choice of going on or turning back without running out of gas.
Of note after having my light fixed so it wasn't on all of the time it didn't come on when it should have. I finally ran it down low enough for the light to start flickering on and off and I immediately gased up and it required 3 gallons indicating 1/2 gal left in the tank and that would only take me about 27 miles. That isn't enough of a safety factor for me and I'm having the dealer recalibrate it so that it comes on with 1 gallon remaining. I want that 50 plus mile range.
When I used a petcock with the reserve I always used one that left me with about 50 miles of gas in the tank and there's no reason why a low fuel indication shouldn't do the same. Remember the only reason the low fuel light is required is because fuel injection requires a fuel pump and the pump is mounted in the tank.