EPA Fuel Estimates

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Jmac
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EPA Fuel Estimates

Postby Jmac » Thu Sep 29, 2005 2:22 pm

Did anyone else read the issue of Consumer Reports where they compared the results of a more realistic driving style to EPA's more ideal (for milage) methods using many of the emerging "fuel saving" technologies (displacement on demand, hybrids, etc.) ?

I can't remember the exact results, but I think I saw the Hemi V8 rated at 20 mpg by the EPA actually got about 10 mpg in CR's testing. Many of the Hybrids also got significantly worse fuel economy than rated. I don't know how aggressive CR was driving, though or if they had specific methods, etc., but it was an interesting read, nonetheless. It also firmly enforced my opinion that diesel is still the best way to go about saving money.

I've always thought the EPA procedure resulted in misleading numbers as they test at 48 mph on an open road in top gear. A significant number of highways have speed limits of 60 MPH or more nowadays, too, which would immediately increase fuel consumption by 25% by itself (Fuel consumption (Volume/Time, not Distance/Volume) is proportional to RPM which is proportional to Speed. Since the EPA tests in top gear, RPM must go up to increase Speed). Add to that increased throttle input (decreased Air:Fuel Ratio) to overcome the increased Air Resistance and you're looking at significantly lower numbers than rated by the EPA in many cases.

EPA Procedure - http://www.epa.gov/fueleconomy/420f04053.htm

Does anyone own any of these vehicles ? Have you been plotting your fuel economy (actually plotting, not guessing like most people I know do) ? How do they match up to the EPA's ratings ?
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zac.carlson
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Postby zac.carlson » Thu Sep 29, 2005 4:42 pm

According to the sticker from our car, it does 24mp/g city, and 29mp/g highway.

Our car gets about a 60/40 highway to city split. We bought our car 24 April 2004 - brand new - and in that time, we have gotten exactly 26.0 miles to the gallon. The best mp/g we've seen is 31, and the worst is 20.5. This data was achevied over the full 17 months, 130 distinct trips to the gas station.

We have a 2004 Maxda 3 hatchback. Considering that we probably drive it a tad harder than most, we fall right about the average, we should see a tad bit better gas mileage due to the slight dominence of highway driving though.
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Postby MorbidDK » Thu Sep 29, 2005 8:08 pm

My Eclipse is rated 20/26. I generally get 26-30 if I drive nicely, I probably get about 21-22 when I drive like a MANIAC!!!, but I've not actually driven a full tank running the car hard. :) I can pull nearly 400mi on 13gal, yes I know my car is a 16+gal tank, but the light comes on at 3gal remaining. Every fillup I write my trip mileage for that tank and calculate it when I get home.

Its already well known that the EPA tests are flawed when it comes to Hybrids because they overrate for the battery usage when in reality the batteries aren't used much in normal use, aside from stops and idling.
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Postby RADEoN » Fri Sep 30, 2005 11:16 am

my aurora is rated 18-24 i believe, and i get like 16
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Darthn3ss
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Postby Darthn3ss » Sat Oct 01, 2005 1:09 pm

our 2005 focus gets about 26a nd 29, which i belive is almost right on what Ford says.
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Postby bass_lover1 » Sat Oct 01, 2005 2:51 pm

Muwahahaha....


about 26 city and 35 highway...I can get it up to 40 if i stay around 45-50 on the highway...but then whats the point?

BTW...1.8T Passat w/ a 5spd Manual.
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Postby rthompson » Mon Oct 03, 2005 5:16 pm

I get about the rated 18/26 for my LT1 Camaro Z28..... and i drive hard.
My Tahoe gets 15-16 MPG no matter what kind of driving i do, and that includes pulling a tandem axel trailer..... anyone know what the EPA rating for a 2000 Tahoe Z 71 is?
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Oxygen
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Postby Oxygen » Mon Oct 03, 2005 9:24 pm

Checked VW's site, my golf tdi is rated 37 city 44 highway.

I'm getting about 40mpg. It will keep getting better, but at the moment i only have like 4500km on it, and i've read it can take 10k-20k km before i start seeing real good mileage.

My friend's gotten 46mpg on the highway
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B_Campbell
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Postby B_Campbell » Sat Oct 08, 2005 10:16 pm

I dont want to know what my impala gets.... ehhh
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Postby TalNLnky » Sun Oct 09, 2005 3:21 am

i have a 2.0L mazda 626 which is basically what the newer Mazda 6's were based off of.... lil different... but not to different.
Anyways.. the 2.3L 4banger is rated @ 23/28 and i can honestly say that my 2.0L 97 626 gets on average 27-30 in mixed driving... by mixed i mean prolly about 30-40% city/60-70% highway.
When i drive to seattle (all highway) i get 31-32mpg, and thats doing 75-80mph.



as far as SUV's go... i think those ratings are bunk.... I previously had a 86 jeep cherokee... 2.6L v6... it did 17mpg give or take 2mpg.... same thing with my buddies Bronco II.... and my other buddy's 93 laredo gets 15mpg. SUV's blow at milage... can't deny it, they are work horses.
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