I took gramma's car out today for a 117 mile cruise with my son. Mostly highway speeds. It was about 70 degrees out and at 75 MPH the temp was around 170. It moves up to around 190 in traffic but immediately resets to 170 when the car is moving again. The car cruises so smoothly with those 3.08s that my teenaged son fell asleep half way through the trip, even with the loud exhaust!
It did use around 3/4 of a tank, too! I think it gets around 8 MPG (highway). Your actual mileage may vary.
When we got home I changed the oil and filter as we just hit the magic 1,000 mile mark on the new 455.
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