Beware the ASAP attitude. Just make those many obvious small changes that will be sustainable, and make you more efficient in many ways. Drive less (even the edge of a parking lot rather than the closest possible to the store entrance), walk or bike more (saves $ for trips!). Why pay some kid to drop a paper at your front door when you can walk somewhere to get it if you really want one? Pack your own lunches-eat better for less. etc, etc, etc...Whatever works for your situation. And do take care of your joints so you can enjoy progressively longer trips.