MPG Ratings Will Drop Under EPA Proposal

375 messages, Last post on Oct 02, 2008 at 9:08 PM

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What is this discussion about? Fuel Efficiency (MPG)

See this Edmunds.com article! EPA Overhauls Fuel Economy Estimates for 2008 - As the 2008 model-year cars hit the lot, shoppers will notice a big difference — the EPA has changed its fuel economy testing methods to produce mileage estimates that reflect "real world" driving habits. - (more)

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#4 of 375 Finally !!!!!!!!!!!!!!!!!! by larsb Jan 11, 2006 (9:32 am)
'Bout dang time they change the test !! People have been crowing about this for about a decade now at least !!!
#5 of 375 . by sls002 Jan 11, 2006 (9:39 am)
The EPA should conduct real test of fuel consumption instead of making it a part of the emmissions tests. A useful result would be to have a steady state fuel consumption at say 45 MPH, 60 MPH and 75 MPH so that one could see how well a vehicle would do on real world highways. Stop and go driving is a real mess. A cold engine will burn more fuel than a warm engine, so a 2 mile drive to work will result in a much worse comsumption rate than a 10 mile drive to work.
#6 of 375 they estimate by nippononly Jan 11, 2006 (3:50 pm)
that the ratings will drop around 20%. They are going to start using the A/C during the test, and will also drive them real highway speeds (probably 65, I would guess). It will be a good thing. Right now they are kind of pie in the sky for many folks (although I personally always achieve mileage somewhere in between the two ratings). Replies to this message: scott1256 (Jan 11, 2006 4:04 pm) carlisimo (Jan 11, 2006 4:09 pm) explorerx4 (Jan 11, 2006 5:52 pm) carlisimo (Jan 11, 2006 6:04 pm) and 5 more... sls002 (Jan 12, 2006 1:16 pm)
#7 of 375 Much worse for hybrids. [nippononly] by scott1256 Jan 11, 2006 (4:04 pm)
Replying to: nippononly (Jan 11, 2006 3:50 pm) From Autoextremist today: mileage estimated to drop 5-20% on most cars. Hybrids will fall much more: 20-30%. This will be a hit for the hybrid market but may be more realistic. http://www.autoextremist.com/page6.shtml Page down a litte to the paragraph about mileage.
#8 of 375 Re: they estimate [nippononly] by carlisimo Jan 11, 2006 (4:09 pm)
Replying to: nippononly (Jan 11, 2006 3:50 pm) "and will also drive them real highway speeds (probably 65, I would guess)." hah! As for hybrids, the new numbers may reduce showroom traffic, but they'll also reduce complaints by owners. Dealers have complained that they're legally not allowed to give realistic mileage numbers because you have to display the EPA figures. There could also be an effect on tall-geared engines like the Corvette (is "tall" correct?), which will suffer a greater change (proportionately) in revs at the more realistic highway speeds. Replies to this message: explorerx4 (Jan 11, 2006 5:52 pm) carlisimo (Jan 11, 2006 6:04 pm) starrow68 (Jan 12, 2006 12:09 pm) nippononly (Jan 12, 2006 2:10 pm) and 3 more...
#9 of 375 Re: they estimate [carlisimo] by explorerx4 Jan 11, 2006 (5:52 pm)
Replying to: carlisimo (Jan 11, 2006 4:09 pm) i disagree about the corvette. real world highway mileage is very good. the engine will work better at 65 mph than the 55 or whatever the epa test uses. the corvette trick (1 to 4 shift) is to help the city mileage rating. to be honest, i don't know if it still uses that. Replies to this message: carlisimo (Jan 11, 2006 6:04 pm) starrow68 (Jan 12, 2006 12:09 pm) nippononly (Jan 12, 2006 2:10 pm) rorr (Jan 12, 2006 2:42 pm) and 2 more...
#10 of 375 Re: they estimate [explorerx4] by carlisimo Jan 11, 2006 (6:04 pm)
Replying to: explorerx4 (Jan 11, 2006 5:52 pm) I think the EPA uses a 60mph maximum, with an average speed in the 40s (!). That means a lot of economy cars are forced to shift into a lower gear for some of the test, which puts them at a disadvantage compared to big engined cars (if I'm right about the current test). That was my line of reasoning, but real world info matters more. But if Corvette owners are getting their rated mileage, they really need to find some funner roads... Replies to this message: starrow68 (Jan 12, 2006 12:09 pm) nippononly (Jan 12, 2006 2:10 pm) rorr (Jan 12, 2006 2:42 pm) nippononly (Jan 12, 2006 2:49 pm) and 1 more...
#11 of 375 Re: they estimate [carlisimo] by starrow68 Jan 12, 2006 (12:09 pm)
Replying to: carlisimo (Jan 11, 2006 6:04 pm) Some cars, like the Corvette, have been tailored to the test to get a great result (no gas guzzler tax at 400hp or even 505hp), and that has resulted in some drivers getting very good real world results. However, the variation in milage for Corvette drivers is very wide since some don't like to get into 6th except for very high speeds while I'll use it on any flat road over about 40mph. Others like to listen to the exhaust note and stay in 4th and don't even get to 5th much. Don't have any experience in the older 4 speed autos. The new 6sp auto should be good news for mileage. At about 45mph on a flat road my instant mileage readout is at about 35mpg in 6th gear. Of course there are places you have to stop and idle in the real world, hence I average in the low 20's, while the wife who drives much more conservatively on take off than I do, averages in the upper teens, go figure. Randy
#12 of 375 CAFE? by robertsmx Jan 12, 2006 (12:20 pm)
Does it follow suit, or sticks to its current standard?
#13 of 375 Re: they estimate [nippononly] by sls002 Jan 12, 2006 (1:16 pm)
Replying to: nippononly (Jan 11, 2006 3:50 pm) On long highway trips with my Seville I can average around 29 MPG by taking it easy. This is well over the highway rating. For local driving I average more than the city rating but less than the highway rating. Everyday driving is not something that the EPA tests can predict for anyone unless they happen to drive exactly like the test.