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Old 10-19-2008, 08:28 PM   #9 (permalink)
cfg83
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Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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90 day: 40.49 mpg (US)
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Matt -

Hrmmmm, interesting POV. Here's another one from a $ POV. Assuming $3.50 per gallon :

New (Ecomodder) MPG : 40+
Usual fill-up : ~5.5 gallons (1/4 tank to 3/4 tank)
New fill-up Miles : 40 MPG * 5.5 gallons = 220 Miles
Cost : 5.5 gallons * $3.5 = $19.25

Old (pre-Ecomodder) MPG : 30+
Gallons to go 220 Miles : 220 Miles / 30 MPG = 7.33 gallons
Cost : 7.33 gallons * $3.5 = $25.67

Cost Difference : $25.67 - $19.25 = $6.42 => ~$6.50 for each fill-up.

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Now, let's look at a year. I project about 20,000 miles this year :

20,000 / 30 MPG => 666.67 Gallons
20,000 / 40 MPG => 500.00 Gallons
Difference = 666.67 - 500.00 = 166.67 Gallons saved per year

Money Saved Per Year : 166.67 * $3.50 = $583.45

CarloSW2
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