Quote:
Originally Posted by Xhifer
The most common way? I fill up at a pump, reset trip meter, drive 230 miles, go back to the same pump, fill up, and divide 230 miles by gallons filled at the same pump. I do not have a gauge. I've tested my trip meter and it's spot on.
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The biggest source of error with this method is the very significant differences you'll find between one pump and another even at one station. The imprecision of the pump and the car's fuel tank gauge is notorious, and it might be the reason for much of the fluctuations in your FE numbers. You can mitigate but not eliminate errors in two ways: (1) always fuel up at the same pump at the same station, filling the tank from near empty, and setting the handle to the slowest flow rate, stopping at the first click. (2) buy an after market gauge, such as the Ultra Gauge or the Scan Gauge. It best to do both of these. The on-board fuel gauge will allow you to test your mods with more precision, over more tightly controlled conditions.
As for the gap, I'm sorry that I don't know the HX recommendation. I'm surprised it's not in the Honda Service Manual or your owners manual. But another option, if Brucepick does not know, is to call a dealership or (better) the autoparts store where you bought the plugs and ask... see if they'll help.
Good luck... and hey... start a fuel log here on EM for your car. It's a solid and easy way to record your performance and examine your progress.
james