1989 Environmental Rsch and Devp Corp ERD 1 MPG & Specs — Real Fuel Cost
Quick answer
The 1989 Environmental Rsch and Devp Corp ERD 1 gets an EPA-estimated 15/17 MPG (city/highway) and 16 MPG combined, with an estimated $4,750/year fuel cost and 555.438 g/mi CO₂. Engine: 2.9 L 6-cyl.
The 1989 Environmental Rsch and Devp Corp ERD 1 with the 2.9-liter 6-cylinder premium gasoline engine returns an EPA-estimated 15 MPG in the city and 17 MPG on the highway, for a combined 16 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 2.9 L 6-cyl |
| Transmission | Automatic 4-spd |
| Drive | Rear-Wheel Drive |
| Fuel type | Premium Gasoline |
| Vehicle class | Two Seaters |
| MPG — city | 15 |
| MPG — highway | 17 |
| MPG — combined | 16 |
| Annual fuel cost* | $4,750 |
| CO₂ tailpipe | 555.438 g/mi |
| EPA GHG score | — |
How efficient is it?
With a combined 16 MPG, the 1989 Environmental Rsch and Devp Corp ERD 1 sits in the low range for fuel economy. That is roughly 20% thirstier than the typical Two Seaters of its era (20 MPG class average) — expect higher fuel bills than class-average alternatives.
Fuel economy and running costs
At about $4,750 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 1989 Environmental Rsch and Devp Corp ERD 1. Over five years that is roughly $23,750 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 1989 Environmental Rsch and Devp Corp ERD 1 emits approximately 555.438 grams of CO₂ per mile at the tailpipe. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.