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Old 01-10-2008, 07:10 PM   #17 (permalink)
RH77
Depends on the Day
 
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Join Date: Nov 2007
Location: Kansas City Area
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Teggy - '98 Acura Integra LS
Sports Cars
90 day: 32.74 mpg (US)

IMA - '10 Honda Insight EX
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90 day: 34.76 mpg (US)

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Well it turns out that the tune-up actually resulted in a big jump in FE. The Winter baseline was 30-31 mpg, with the tune-up tank coming in at 34.4 mpg.

That's about a 10% increase in FE.

Subsequent tanks are required to get a final tally, here are a few hypotheses...
  • The plugs and wires were in sad shape.
  • The plug gap was increased over spec
  • Seafoam was dumped directly over the valvetrain and run through the system for 3 miles, and then...
  • The oil/filter was changed

I never got around to changing the air filter. Soon though...

Strangely, ambient temps were in the +5F to 25F range, with some slushy, Winter weather present. I even carried passengers. Most driving was highway. We'll see what happens with subsequent tanks -- it's warmed up out to around 30-60F, so we'll see.

As it stands now, the tune-up seemed to help FE.

Happy Hypermiling...

RH77
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