the best remedy for fuel economy is to stagger days you drive the skyline. carpool, or consolodate trips to the market, etc. swap the flywheel for an aluminum one as well as the crank pulley. make the engine easier to turn any way you can. use lightweight rims. do not use the air conditioning - ever. get a carbon fiber hood. use aluminum brake calipers. change the plugs evey six months. keep the tires properly inflated. ensure clean air passages. create a business out of your home office and commute six feet to work.
have a party. dress in a gorilla suit. wear a tuxedo to a skating rink. invent a new device. learn to sing backwards.