Now that temperatures are going down for Newbies you may have noticed your MPG's go down also. You can expect 2 MPG drop for each 10*F drop in temperature. So a temp drop from 70*F to 40*F would be a drop of 6 mpg.
Here is what you can do to to get some of that back without spending a lot of money.
1. Use some kind of Grill blocking method, Grill Covers, foam insulation or tape. Center Grill opening should be covered all year around, I have been using Grill Covers for three years/ 110K mi. now. I only remove the lower Grill Cover when going on long uphill grades. Worth 2-4 mpg's
2. Use 50 PSI in your tires, not much difference in ride quality, but it improves mpg's and your tires wear great. I got 64k mi. on first set and looks like I will get around 70K on second set. Worth up to 1mpg.
3. Oil Pan Heater speeds up ICE heating and heat available for the car heater. The only Oil Pan Heater I could find small enough to fit the bottom of oil pan was a Wolverine Model 9 Oil Pan Heater which you can get on eBay. I'm going to put another one on the back of block to get the total wattage to 250 Watts, but enough to raise WT by 40-50*F. Worth about 2-5 mpg on short trips and you have heat almost immediately. YA!
4. Park facing the Sun which will keep ICE and inside of car warmer. If you can use seat warmers instead of heater. Worth 1-4 mpg. Make trips during the warmest time of the day. These are kind of obvious ideas, but they are worth mentioning.
5. Premium Gas is worth 2 mpg in my experience, but may not be worth the additional cost. That is what I use.
PS I will add more as I think of them.