Quote:
Originally Posted by night9
I think I need to get around to doing a speed vs mpg chart. The Automatic transmission is a joke because with the transmission in gear its gas mileage is awful below 45mph. I officially hate torque converters. It only manages 35 maybe 40mpg below 45mph on flat ground. All the 5 to 20 mph trolling I have to do because of traffic kills my averages. I try to coast as much as I can but EOC would make a big difference in my ability to get better gas mileage. I predict I could average 45mpg tank to tank with a manual transmission without a problem.
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This is not universally correct. I have an auto on my 09 Corolla and I routinely get between 42mpgUS and 44mpgUS every summer with no tricks except for driving with load up hills, just using the cruise control and going 55mph (eco mods not included). I can beat my brother any day of the week in his 5 speed Corolla if he is only utilizing the same techniques as I do due to the lower final rpms at highway cruising speed. If he starts doing EOC and other tricks he would turn the tides though.
At 45mph I can further achieve 55+mpg on flat ground using cruise easily. My car has fairly aggressive deceleration fuel cut. So your findings are somewhat an ECU/engine dependent conclusion.