2000 Honda Civic Si:
Engine:
- A'PEXi WSII cat back exhaust, A'PEXi GT headers (painted and wrapped), Comptech Ice Box Intake, AEM Pulleys (red), Royal Purple 5w-30, Denso Iridium Spark Plugs, Redline Water Wetter, Sunoco 94 Octane, 19 degrees advanced timing, Type R painted valve cover, Billet Aluminum Oil Cap

Suspension:
- Koni Yellow Sports, Custom Rate Ground Control Coilovers (350f/400r) dropped 2" front, 1.75" rear, Comptech Rear Sway Bar/Tie Bar, Energy Suspension Bushings, Skunk2 Front Camber kit, Rear washer camber kit, Neuspeed Front Upper Strut Bar, Neuspeed Front Lower Strut Bar, Neuspeed Rear Upper Strut Bar

Alignment:
- 2.5 negative front, 1.5 negative rear, 0 toe front and rear
weight of car with 1/4 tank of gas - 2450lbs.

Stoppers:
- Brembo Rotors, Hawk HPS Front & Rear Brake Pads, Goodrich Stainless Steel Brake Lines, Valvoline SynPower Brake Fluid

Wheels & Tires:
16x7" Rota Circuit 8, 205/45x16" Toyo Proxes 4

I get about 30-32mpg highway, and 25-27mpg city


1989 Civic si
Engine:
stock

Suspension:
stock

Alignment:
stock

Stoppers:
stock

Wheels & Tires:
15x6" 2000 Civic Si wheels with 195/55x15" Nokian Hakkapelitta 2 snow tires

With this one I get about 35-40mpg highway and 30-35mpg city.