What is the record for longest distance of a production vehicle using the factory gas tank?
 

Does anyone know this?

I remember about 10 years ago there was a '97 Passat TDI wagon hit 1,400 miles (without the vent mod. which increases capacity from 21 to 26 gallons.)

I am sure this has been surpassed by now.

I assume plug-in hybrids don't count?

I was curious about non-hyrbids, but if you know the answer for a hybrid I am now curious.

I did find this world record:

https://www.csmonitor.com/Business/I...ne-tank-of-gas

It is funny how it says "tank of gas" when clearly this is diesel powered.

Looking at the photo, the car appears unmodified and its sporting pretty big tires to be achieving 84 mpg.

There is nothing in the article about how this 84 mpg was achieved. P&G? Drafting?

Most likely not.

'longest'
 

I'm unsure whether such a claim has ever been made. And if it had, all the context for the conditions of the 'test' would have to be provided.
Official EPA numbers are all generated on dynamometers, with 'fudge-factors' applied, to attempt an adjustment to 'real-world' driving.
No claim could be accepted on face without all the conditions.
Currently, the highest mpg-e would be attributed to the M-B EQXX driven on dark side of the Moon.:)

Wasn't there somebody here who went a really long ways on a tank of diesel in a Cummins Ram? I can't remember but it was well over 1000 miles. He did it commuting over months no less, not all in one heat cycle.

Maybe instead of just longest distance on a tank (which depends on the size of that tank as much as anything else), we could look at the max distance compared to the manufacturer's declared range?
Has anyone successfully doubled that range? Similar to the percentage over mpg in our Ecomodder signatures...

doubled
 

I got close with my grandfather's 1961 Dodge D100 pickup.
It went from 11-mpg @ 50-mph, to 21.5-mpg @ 65-mph.

Which engine did it have?