trqmnstr said:Hohn, I don't understand your readings. I believe my fuel gauge is pretty accurate, well, at least before the FP60. The needle reading and odometer mileage readings were consistent every time before the additive. If I was reading 387 miles, my needle would be somewhere around 3/8 of a tank. Also, I have never gotten any less than 19 mpg. That's my minimum! That is hand calculated. Why are our readings so different? I have a ton of miles on my truck compared to your 40-50k but I feel my gauge is a little more accurate. What do you think? Oh yeah, if my gauge read 387 at just over half tank, I would be in the 28 mpg range. Yeah baby!
Every vehicle I've ever owned had LESS than half a tank left when half-tank was indicated
So given that I have a 35 gallon tank, I expect to take on about 20gal if I fill up at half-tank mark.
The FP60 must cause gauge issues, because it took 20+ gallons to fill, and it wasn't yet at half tank mark.
So, I'm led to believe that while the FP60 DEFINITELY helps with mpg, it ALSO causes the fuel guage to act in a way that makes it APPEAR to give more improvement than it does. So it's given me maybe 1. 5-2mpg in town, probably better onthe hwy. But it makes the gauge think I'm getting 30mpg

How exactly does the fuel level indicator on these things work? Does it have a float? Is it capacitance based?
Hope this clears things up.