Your nephew is now going to get 50 mpg at the traffic light drag strip!
Seriously, thanks for the report. It's good to have the information.
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Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.