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Old 09-16-2009, 12:14 AM   #9 (permalink)
Fr3AkAzOiD
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Join Date: Jul 2008
Location: Raleigh, NC
Posts: 259

Cobalt XFE - '08 Chevrolet Cobalt XFE
Team Chevy
90 day: 41.1 mpg (US)

'05 Malibu V6 Tow Vehicle/Track Car - '05 Chevrolet Malibu LS V6
90 day: 23.12 mpg (US)

'08 XFE average for 2013 - '08 Chevrolet Cobalt XFE
90 day: 41.1 mpg (US)
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The 70 mph speed limit areas will kill you.

I used to jump on I-95 in a 70 zone and I'd be lucky to get 45 mpg on the flat, usualy more like 40-42. Got on Google maps and found some back roads that actualy cut out a few miles of my trip and I am able to do 45 mph and get 55 mpg on the flat.

Also I'm sure your 7ft CB antenna isn't helping much with your areodynamics.

I did a test run through several tanks with different styles of driving to show what I got when I first started. May give you an idea of what to expect.

I did these within the first 3,000 miles in July and August in Maryland before the car was even completly broken in and I moved to North Carolina.

30.14 mpg
This was my tank for your average driver. Tires we deflated down to around 28 - 30 psi, I ran with the A/C 90% of the time, reved higher, didn't time traffic lights, generaly accelerated away from lights at whatever pace the person next to me did. My mpg was actualy pretty close to what the average estimate is and if this is how most people drive no wonder they are complaining about gas prices.

36.15 mpg
This was my Conservative tank. Pretty much just a public service announcement style "check your tires air pressure and slow down". NO EOC or P&G just slowing down and timing traffic lights as best as possible and used the A/C like a normal person would but my tires were inflated to 2 psi under sidewall max. Considering I would still go 58 - 65 on the highway getting over 36mpg was pretty damn good since 36 is the highway rating and I only drive about 60% highway. Even though this tank I allowed myself to use the A/C whenever I wanted it wasn't a hot week and I didn't need it that much.

37.87 mpg
Eco driving without EOC or turning off engine at lights. Hot week, A/C may have lower mpg a little bit.

40.33 mpg
This tank is EcoDriving with engine off at lights. Tires were inflated so once warm were 2psi below sidewall rated max, P&G but no EOC, stuck to speed limit on highway and would kill the engine when coming up to a red light. Hot week, needed A/C.

48.03 mpg
Hypermiling tank. The works, P&G, EOC, no A/C. Only thing I didn't do was drafting.


So depending on how you are willing to drive you can see a wide range of results but once broken in you should be able to see lifetimes averages in the low to mid 40's.

Just don't let winter cause you to stop eco driving, I got frustrated by falling mpgs and let them fall even further to the mid 30's.
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