synthetic oils will help the motor and you might gain a 1 or 2 mpg

 

and I know 1 person who'd still be one of my best friends had he been wearing a seatbelt when he wrapped his 3000gt around a tree. Always wear your seatbelt. The times when a seatbelt hinders your safety are few and far between.

anyway, try this out for gas-saving tips: http://www.howtoadvice.com/savinggas

 

Put thinner tires on, put a sheetmetal diffuser under your back bumper or just cut some large holes in it, pull your AC and PS.

Or, realize that you're driving a Civic and already have great gas mileage.