The 380SE tachs over 2,800 at 80 mph in top gear. Of course, it's got a lot lower final-drive ratio than your car does. That's where the difference in fuel economy comes from, I'm willing to bet.
I wonder if a 420SEL from the same year as your car would get better mileage than your 6-cylinder. It has the same final-drive as our 380SE.
Quote:
|
I get just under 30 mpg on the highway at 120 km/h (around 70-75 mph) with my 3.8 litre 6. Going to a 300 SD I realize I will actually be getting worse mileage, and lower power,
|
Nice! I can't think of any other engine of that displacement that gets as good mileage as the old GM 3.8 V6.
-Sam