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[EHart6]

Originally Posted by alanjoseph

what could be the reason?

I don’t think you going to get much better than 22-23. My 89 Tercel 3e carb gets 37-38 mpg (all highway). If I run a mix of roughly 50/50 (city/highway) it drops to 30 “FAST”. Which means in the city I am only getting 22-23.

Stop and go, slow down / speed up is a killer on the fuel economy. Map out your driving and see if there is a route(s) that can hold you to a constant speed. It doesn’t matter if it 35, 45, or 55 as long as it is constant. Fewer the stops the better. I drive 10 miles out of my way to run 99% highway and 4 stop signs (60 mile commute @ 60mph). I could save the 10 miles but would have to drive through 2 towns, two dozen stop signs, and speeds ranging from 25 to 65.

I think your right about the exhaust, I read somewhere the larger exhaust helps at high rpm and takes away from the lower rpm. Unfortunately I am not an expert on this.