Military jerry can. Sure they are not vented? They ARE pretty heavy duty.

 

It appears not. I put 2 gallons in one. Locked it and flipped it around. No gas came out. Had it in the garage overnight and no smell. My garage is almost sealed due to the wind/rain combo it gets.

 

Those military cans probably have a pressure relief function. The problem with those is, he's going to have to stop 3 times to fill up from each of the 3 cans. It would be faster to just stop at a gas station to fill up. And to the OP, if you are running your car down to 12 gallons then you have bigger balls than me. My car shows no bars at 10 gallons, and I get between 21 and 28 mpg depending on driving conditions. To drive an additional 60 miles after the last bar disappears is asking for trouble. I've never gotten more than 300 miles out of a tank.

 

They are huge, makes it difficult to sit. Kidding...

When the gas light comes on I've consumed 11gallons of a 13.2 gallon tank. Assuming for a moment .2 is in the lines and a factor of error. Driving an additional 30 miles with the light on is well within my range.

More over though, this is a rare situation. My little project is for occasional use on extremely long road trips.

In our TL I drove 1600 miles in 24 hours and only stopped for gas and food along the way. Some of the places we drove through I would rather not have stopped the car at the gas station or been concerned about running dry between gas stations. On a few of my travels I've seen 150 miles between gas stations.

Yes I'm strange. I know. I like to tinker and do odd things.

My little project is to give me temporary access to more gas on such travels. I am aware that gas in the trunk is less safe then a gas tank. I am aware of the risks. Just as we should all be aware of the risks of driving with a convertible.

 

ah what the heck. here are the pictures now. As you can see there is enough room in there for a third, or as I would have it now (if I was on the road) with my emergency road kit.

http://img.villagephotos.com/p/2007-...2/DSC_0410.JPG
http://img.villagephotos.com/p/2007-...2/DSC_0413.JPG
http://img.villagephotos.com/p/2007-...2/DSC_0414.JPG

 

You must be driving a different car than I. My gas "light" comes on at about 9 gallons. The bars completely disappear at 10. And in my observation as well as most others here, those little bars are very inaccurate. I've never gotten over 29 mpg and I drive very conservatively most of the time. You must drive with the AC off, top up, windows up, at 55 mph, 5 feet behind a semi with no stops or traffic.

 

Neat.

I like it, although I would look into the heat issue as well (as mentioned by shedrivesit). I've found that areas of the trunk do get fairly warm due to being above the exhaust.

 

75mph cruise. A/C when needed. Windows/top down as I see fit.

On a 300 mile return trip. I drove with a friend with the top down at 75mph with the A/C on (our feet were hot) and I got 28mpg. I figured top up would have improved things.

One thing I am is very consistent.

 

Am going to. I might even get to test this out shortly. But we'll see. Next step would be the fuel cell, but I'm uncomfortable having that always in the trunk. Since it cannot be removed I'd always be exposed to the risk of the additional fuel/fumes and would prefer not to be.

 

That's impressive. I can never keep my foot out of it long enough to get high mileage.

FWIW, my rough estimate is that running the top down costs about 2 MPG. I think I calculated at one point that if I had run the top up ALL the time, I could've saved about $700 in gas by now...