I don't carry much cash,for obvious reasons,but I always have a credit card and cell phone.I also carry tire repair stuff.On trips,I start with a full tank,and 2 more gallons in semi clear plastic jugs,marked at exactly the 1 gallon point.If I need more gas,I stop at a station,get out both empty plastic jugs,put the right amount of oil in each one,then shake them a little as I'm filling them.I fill them even with the mark,which still allows a little room to mix.I put the lid on,and turn the jugs over a few times.Being almost clear,you can turn them over and around,and make sure that none of the oil is stuck to the bottom or sides of the jugs.This may sound like overkill,and it may be,but in almost 8000 miles,I've never had a lubrication related problem.Peace.Jerry.