Carrying spare petrol?

[Tigadee]

Stored 2 litres of petrol in a Coke bottle for a year to see what it did to the bottle.

It did zilch, nadda, and I used the petrol without any issues.

That's because Coke is such gut-rot that the bottle needs to be industrial strength plastic, strong enough even to hold petrol for a year...

BTW, did your exhaust fumes come out with a lovely caramel fragrance?

[Flip]

Coke Bottles are made from PET (polyethylene terephthalate). It's a good material for non-polar solvents, it's just that the bottle is not an approved container. PET is the same plastic that Polar Fleece is made from.

The std petrol cans are made from PE Polyetheyene which is a lot softer low strength plastic than PET. PE is what plastic buckets is made from.

[Smifffy]

I reckon the tank would have to be pretty small if 1-1.5L would make much difference.

How small is your petrol-tank??

There's tons of gas-stations down here.