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Owner: mpg_numbers_guy
Silver Aero: 2004 Honda Civic EX Sedan Automatic
Displacement: 1.7 L
Fuel type: gasoline
Transmission: automatic
Curb weight: 2668 lbs
Coefficient of drag: 0.32
Frontal area: 22.5 sq.ft.
Instrumentation: Torque app
Description: 2004 Honda Civic EX Sedan in silver, nicknamed Silver Aero, purchased with 152.7K miles.

60% of my driving is pizza delivery, hence the lower tank numbers. Delivering pizza requires me to have a sign atop my car which makes my drag worse than stock per coastdown numbers, even with my ecomods in place. Winter reduces fuel economy by approximately 10%.

Stock drag: .32
Estimated ecomodded drag: .29
Estimated ecomodded drag w/ pizza sign: .33

Personal driving, cruise control: 48-53 MPG. Max speed 40 MPH.
Personal driving, P&G: 50-59 MPG. Max speed 40 MPH.
Personal driving, DWL: 48-64 MPG. Max speed 40 MPH.
Pizza delivery driving: 36-40 MPG. Max speed 55 MPH. Less hypermiley driving.
Personal driving, cruise control: 42-48 MPG. Max speed 40 MPH.
Personal driving, P&G: 47-50 MPG. Max speed 40 MPH.
Build Thread: Ecomodding an automatic '04 Civic Sedan
Current Mods: Current ecomods:
Next Ecomod:
  • Wheel+tire swap to HX rims w/ 185/75/14 tires
    • From 18lbs to 11.5 lbs per wheel, 27 lbs saved total
    • From 20 lbs to 15.7 lbs per tire, 17.2 lbs saved total
    • 44.2 lbs saved total, 138.9 lbs of rotational mass deleted
  • Coroplast rear wheel skirts (after wheel swap)
  • Coroplast front wheel partial skirts (after wheel swap)
  • Rebuild tail extension out of coroplast
  • Rebuild lower grille block out of coroplast
  • LED brake lights ($19)
  • LED interior lights ($7)

Planned Mods: Other planned ecomods:
  • LED headlights ($37)
  • LED reverse lights ($16)
  • Attempt at homemade VGs to keep airflow attached down the rear.
  • Aero/low profile windshield wipers (if/when current ones need replacing) -$18

Ecomods under consideration:
  • Redo mirror boattails
  • Windshield wiper deflector
  • Weather stripping to seal gaps around front hood and rear trunk
  • Weight reduction (theoretically +1 mpg per 100 lbs deleted)
    • Rear seat delete (-29 lbs)
    • Rear seat cushion delete (-10 lbs)
    • Passenger seat delete (-37lbs)
    • AC delete (-40 lbs)
    • Radio delete (-20 lbs)
    • Speaker delete (-8lbs)
    • Total: -144lbs, theoretically +1.4 MPG.
  • Engine pay underbody paneling from same gen Civic Hybrid or a belly pan
  • Power steering delete
Official Fuel Economy Ratings
EPA city 26 mpg(US)
EPA highway 35 mpg(US)
EPA combined 29 mpg(US)

Actual Fuel Economy Performance
Lifetime 41.38 mpg(US)
Last 3 tanks 45.11 mpg(US)
90 days 43.49 mpg(US)
View Fuel Log
Last updated: Jul 22, 2018

(Created: 2018-02-14 22:45:32 / Modified: 2018-07-22 17:47:35)

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