How many miles per gallon does a 1989 7.3 Idi get?
The 1989 7.3 IDI (Indirect Injection Diesel) engine, produced by International Harvester and used in Ford trucks, is known for its durability and reliability. However, when it comes to fuel efficiency, this engine reflects the priorities of its time—power and longevity over fuel economy. In this article, we’ll explore the typical miles per gallon (MPG) you can expect from this classic diesel engine and the factors that influence its performance.
Understanding the 7.3 IDI Engine
The 7.3 IDI engine was designed as a workhorse, primarily for heavy-duty applications such as towing and hauling. It features a naturally aspirated design (no turbocharger in the 1989 model) and a mechanical fuel injection system. While these characteristics make it robust and easy to maintain, they also limit its fuel efficiency compared to modern diesel engines.
Typical Miles Per Gallon (MPG)
On average, a 1989 7.3 IDI engine achieves around 12 to 15 miles per gallon (MPG). This range can vary depending on several factors, including the vehicle's weight, driving habits, and maintenance. Here’s a breakdown of what influences the MPG:
- Vehicle Configuration: Trucks equipped with the 7.3 IDI engine often came in different configurations, such as single rear wheel (SRW) or dual rear wheel (DRW). Heavier configurations like DRW tend to have lower MPG.
- Driving Conditions: Highway driving typically yields better fuel efficiency compared to city driving due to fewer stops and starts.
- Load and Towing: Carrying heavy loads or towing significantly reduces MPG, as the engine has to work harder.
- Maintenance: Proper maintenance, such as regular oil changes, clean air filters, and well-maintained fuel injectors, can improve fuel efficiency.
Improving Fuel Efficiency
While the 7.3 IDI isn’t known for stellar fuel economy, there are steps you can take to maximize its efficiency:
- Upgrade to a Turbocharger: Adding a turbocharger can improve fuel efficiency and power by optimizing the air-fuel mixture.
- Use High-Quality Diesel Fuel: Premium diesel fuels often contain additives that improve combustion and reduce engine deposits.
- Maintain Proper Tire Pressure: Underinflated tires increase rolling resistance, which reduces MPG.
- Drive Conservatively: Avoid aggressive acceleration and maintain a steady speed to improve fuel economy.
Conclusion
The 1989 7.3 IDI engine is a testament to the engineering priorities of its era—durability and simplicity over fuel efficiency. While its MPG may not compete with modern diesel engines, it remains a reliable choice for those who value its rugged performance. By understanding the factors that influence fuel economy and taking steps to optimize efficiency, you can get the most out of this classic engine.
Frequently Asked Questions
How much HP does a stock 7.3 IDI make?
International Harvester IDI
| IDI | |
|---|---|
| Oil system | 10 US qt (9.5 L; 8.3 imp qt) |
| Cooling system | Water-cooled |
| Output | |
| Power output | 161 hp (120 kW) (1983), later 170 hp (127 kW) @ 3,300 RPM (6.9 L) 185 hp (138 kW) @ 3,000 RPM (7.3 L) 190 hp (142 kW) @ 3,000 RPM (7.3 L turbo) |
How many miles can you get out of a 7.3 idi?
With commercial usage so they rack up lots of miles every year, you can expect over 500,000 miles before the first overhaul. But for Average Joe that puts on 20,000 miles per year on the truck, then about 20 years or 400,000 miles is about all you can expect, even with outstanding maintenance.
How many gallons does a 7.3 diesel take?
The 7.3 Powerstroke's fuel capacity varies based on configuration, with some models holding nearly 40 gallons of diesel.
What is the average lifespan of a 7.3 diesel?
Powerstroke Engine Average Life Expectancy:
7.3L400,000-500,000 miles. 6.0L200,000-300,000 miles. 6.7L200,000-300,000 miles. 6.4L150,000-200,000 miles.
What is the MPG on a 7.3 idi diesel?
22.7 mpg on the highway not going over 65 mph. bad news is i get about 12 mpg in town driving.
What years to avoid 7.3 Idi?
1994-1998 Model Years
Not only are the 1994-1998 engines the oldest, but they also produce the least horsepower of the Power Stroke 7.3-liter family.
What's better, 6.9 idi or 7.3 idi?
The 6.9, with its smaller bore, is better than the 7.3 if you're running LOTS of boost. If not, no difference except a little less power.
How many miles per gallon does a 7.3 L v8 engine get?
The Ford 7.3 gas engine is comparable, getting 8-14 miles out of every gallon, with some drivers getting up to 17 MPG on the highway.
How often do you change the fuel filter on a 7.3 Idi?
Oil and Filter - Oil change service intervals should be completed as indicated by the instrument cluster message center or every 7,500 miles. Fuel Filter Change - Change every 3rd oil change or every 15000 miles(24,140 km) or as indicated by the message center which ever comes first.
What years to avoid 7.3 IDI?
1994-1998 Model Years
Not only are the 1994-1998 engines the oldest, but they also produce the least horsepower of the Power Stroke 7.3-liter family.
