I found a new way to increase the gas mileage of my vehicles. Unload your trunk. Today's cars are built for very little tolerance of weight.This is a trick from hyper milers- they will not only unload the trunk, they will take out seats and the spare tire, and other things I am just not ready to do. But I can unload the crap out of my trunk. Upon a recent inventory of my trunk, I have a bag of rocks (for landscaping), a bag of top soil, miscellaneous tools,Cans of paint, which weigh in all total approximately 160 pounds or 1 average person. "Hey fat ass, get outta my car!" Anyway with that all removed and a few items from the back seat- (Amazing how one person can get all this into one sub-compact car, but hey when you have talents...). And the next time you have a flat and don't have to spend an hour taking everything out of your trunk to get to the spare, you'll thank me.
Now it is clean ORGANIZE-
Now some folks like to put organizers in there car to keep things separate. And I have seen these things for sale at ridiculous prices! I say scaaaaaaareeeeeeew that and use what you got. You can put things in plastic grocery bags even. Me- I choose to use all the lap top bags I have. This way you can reuse an item and organize your trunk at the same time. I have also used 1 gallon plastic plant pots(for loose tools), milk crates. Anything that fits.