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California98Civic · 06-13-2018, 09:26 AM

Car is running great since I did the head gasket job, flushed my cooling system, installed 15" wheels for the taller gearing, and made the rear wheels quite smooth to the airflow.

I drove a 130 Mi round-trip yesterday for work that averaged 64 miles per gallon. But what was most fun about it was that I did very little engine off coasting. I did at least 50 miles of steady throttle cruising. I did some engine on coasting. And my EOC was mostly in the stop/go LA traffic.

Before the repairs and the new wheels, I had noticed a breaking point in the fifth gear cruising characteristics of the car that looked like this: it wasn't possible to stay at or over 60 miles per gallon if I was at or over 40% engine load and it also wasn't possible to stay under 40% load if I was trying to travel over 55 miles per hour. Now I can do 60 miles per hour at 60 miles per gallon at 45% load. 40% load has become the breaking point for 70 miles per gallon.

06-13-2018, 09:26 AM	#1 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 Black and Green - '98 Honda Civic DX Coupe Team Honda 90 day: 66.42 mpg (US) Black and Red - '00 Nashbar Custom built eBike 90 day: 3671.43 mpg (US) Thanks: 2,373 Thanked 2,172 Times in 1,469 Posts	Great awful commute fuel economy Car is running great since I did the head gasket job, flushed my cooling system, installed 15" wheels for the taller gearing, and made the rear wheels quite smooth to the airflow. I drove a 130 Mi round-trip yesterday for work that averaged 64 miles per gallon. But what was most fun about it was that I did very little engine off coasting. I did at least 50 miles of steady throttle cruising. I did some engine on coasting. And my EOC was mostly in the stop/go LA traffic. Before the repairs and the new wheels, I had noticed a breaking point in the fifth gear cruising characteristics of the car that looked like this: it wasn't possible to stay at or over 60 miles per gallon if I was at or over 40% engine load and it also wasn't possible to stay under 40% load if I was trying to travel over 55 miles per hour. Now I can do 60 miles per hour at 60 miles per gallon at 45% load. 40% load has become the breaking point for 70 miles per gallon. __________________ See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.