You can't expect perfect highway fuel economy along a trip to Yosemite, HWY 1, and across the grapevine pass between the Valencia and Button Willow. My 1.8L Integra with 4 passengers were pulling 4.5k rpm for a few minutes going 70 mph with pedal to the floor.
Common sense tell people with older cars to turn off the AC and turn on the heat to full blast when climbing up the hills.
Common sense tell people with older cars to turn off the AC and turn on the heat to full blast when climbing up the hills.