I have two 2005 spectras, one an EX the other a Spectra5... MPG

in my spectra5 I typically get about 27 mpg... and my wife gets about

25 mpg in her EX...

we commute about 155 miles a day (roundtrip)... and the past couple of weeks we've been driving her car... it has 10k miles, and mine has over 20k.

anyway, I've noticed something odd about the EX's MPG...

if I run the gas down to almost empty and fill up, it's about 25 MPG... if I fill up at about half a tank, I'm getting 29-32 MPG...

actually my wife noticed that... I thought it was just my superior driving skills.

anyway, the only thing that makes sense is evaporation... like they say, numbers don't lie, MILES/Gallons= MPG...

oh, and this is in the Texas Hill Country/Highland Lakes/Austin area, so it gets a little hot here... but really it hasn't been THAT hot until this week... it cooled off today, the high was just 99 in Austin. but it seems consistent all year... it's not quite 1 year since we bought them.

Reply to
Captain Spaulding
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I am experiencing the same exact thing with my 2004.5 EX! It has 24k miles on it, btw.

So what's the mechanics of the theory then? More airspace in a tank that's half full or less allows a greater level of evaporation???

Anyone else out there that can weigh in on this?

Reply to
googlegrps

After doing a little Googling, it looks like this is phenomenon experienced with other makes too.

Check this link out along with the possible explanations:

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Reply to
googlegrps

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