Alright so I am back to square one. 2 or 3 straps is not the telltale. Is there a MFR mark of some sort on the tank itself that shows for sure whether it's a 26 or 32 gallon tank? I thought the strap issue was good but it appears it is not accurate.

 

Should be a part number cast or stamped into it somewhere. Probably somewhere you can't see it, unless you pull the bed.

 

Clearly it would be easy to check by pulling the bed....

 

https://www.chrysler.com/hostd/windo...kerPdf.do?vin=

put your vin number at the end,,, as the bigger tank was an option and it will show on the window sticker ,,, it will be near the bottom of the options

 

Yes, 26 gallons. Crappy calibration on the gas pump. Thanks.

 

Just filled up. Fuel light was on and it said 30 miles until empty. The fuel light was on and I put 27.7 before the pump shut off. It looks like it's about a 29 or 30 gallon actual capacity. This is going to help for my new daily commute.

 

i have a 17 with the '32 gallon' tank, i have driven 75 miles with the light on before i stopped for gas and still only managed to get 29 gallons into it. i dont think the actual tank capacity is going to be much less than 32 gallons, but the real issue here is the fuel gauge resolution/accuracy.

try this, drive your truck for an hour (give or take) and park, before shutting off the engine take note of where the fuel gauge is reading. Shut the truck off (all the way off, remove the key). When you get back in take note of where the fuel gauge sits, in most cases its going to be sitting lower than it was when you parked. You still have the same amount of fuel left, the gauge just didnt come all the way back up to where it was. I dont think (i cant prove it) that the gauge ever catchs back up to where it was after you shut it off (unless you stop and fill the tank) so you loose a little bit of percieved range. Noone cares to fix this because it wont cause you to be stranded with an empty tank, its only an inconvenience to those of us who drive long distances and want to maximize time between fillups.

note i feel that the gauges are more accurate on long trips where you dont stop and start than they are for daily driving.

also, all 3 of our cars fuel gauges behave the same way, it has to be something with the way they move the needle or the programming, but im not a software guy so i cant tell ya for sure.