The Sierra Club

Roadway

News from the roadway:
The Current 'Clean Car' Scorecard

Our 'clean car' road tester, Alan Richardson, decided to purchase and drive a Honda Civic GX fueled by natural gas to lessen his impact on the environment. These scorecards track the running total of the economic and environmental consequences of his decision.

The current scorecard

By Alan Richardson
Spring 2008


Period covered: Purchase date (18 October 2000) to 1 April 2008
Distance driven: 110,565 miles
Fuel purchased: 3369 gallons gasoline equivalent (GGE)
Fuel economy: 32.8 miles/GGE
Fuel cost of CNG used: $4081
Average fuel cost: $1.21 per GGE
Cost economy: 27.1 miles per dollar
Savings over gasoline: $2,471
Economic payback mileage*: 82,438 miles
Economic payback date*: 25 August 2006 (Payback complete!)
* Payback of $4500 purchase premium for natural gas fuel option reduced by $2000 Clean Cities rebate and $2000 federal income deduction at 28% marginal tax rate.

The environmental impact:
Estimated exhaust emissions of different passenger vehicles driven 91,029 miles (in pounds)

  Average car California LEV** Civic GX
Hydrocarbons 682 18.3 0.73
Carbon Monoxide 5090 828 38.97
Oxides of nitrogen 339 48.7 4.87
Total 6110 895 44.57
** This estimate is based on the standards for a 'Low Emission Vehicle' passenger car required by California starting in 2001.