I've gassed up a few more times with the Regal -- I can go 14 days between fillups easily, whereas the Park Avenue's low fuel light would have been glaring at me. The Regal seems to have settled at about 23 mpg for my usual usage: 70% city, a 20-mile round-trip commute with faster highway speeds in the morning than in the evening. And 4-6 24-mile, highway-speed round trips to the suburbs per month.
This weekend I drove 120 miles round trip to Houma, LA, along U.S. 90. This highway, well-paved for the most part, varies its speeds from 35 to 70, has some long stretches without lights and several where lights swarm like fireflies. I haven't filled up yet, but the driver's info center is reporting about 26 mpg -- and the DIC has been pretty close to the results I get with the calculation method.
This weekend I drove 120 miles round trip to Houma, LA, along U.S. 90. This highway, well-paved for the most part, varies its speeds from 35 to 70, has some long stretches without lights and several where lights swarm like fireflies. I haven't filled up yet, but the driver's info center is reporting about 26 mpg -- and the DIC has been pretty close to the results I get with the calculation method.