Re: EPA MPG Estimates are Seriously Flawed
The 1983, 1984 and 1985 Diplomat are essentially the same so I just used the 1985 numbers.
The thing is none of those fuel mileages use hypermiling techniques. Just moderate acceleration, run the speed limit and dont "charge" redlights or stop signs. I almost always do better (compared to estimates) on larger more powerful vehicles and struggle to make the estimates on smaller less powerful vehicles. |
Re: EPA MPG Estimates are Seriously Flawed
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I think my 15 mile and 25 minute commute should best be described as suburban. The lights are every 1/4 to 1 mile instead of every 100 yards. I dont know what Im doing wrong with the Accent. I just dont seem to get any better with it than the Mustang on the same commute. |
Re: EPA MPG Estimates are Seriously Flawed
I've just come across a 1980 EPA fuel economy certificate (on the internet) for a Datsun 280zx, 3 speed auto, 2 seater.
It's the closest thing to my model I've found so far, the main difference being mine is the 4 seater and therefore a bit heavier. The fuel rating is 19 mpg. My fuel economy (before hypermiling) ranged from 20.8 to 19.6 mpg (spirited driving) and my last tank returned 22 mpg. So yes, these ratings are only a guide. Even driving like a rat bag I was slightly above their figure. The disclaimer reads "Your own mileage may be poorer depending upon options, driving conditions, your driving habits and your car's operating condition." :rolleyes: |
Re: EPA MPG Estimates are Seriously Flawed
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https://fueleconomy.gov/feg/download.shtml 001 3806015042 3 21 26 23 1107 168A3-1 6 FIAY 20.5489 26.1966 22.7566 6 280ZX 2+2 (FFS) An approximate conversion... 22.5mpg CAFE=17mpg 2008 estimates, 20.5mpg CAFE=15mpg 2008 estimates, and 26mpg CAFE=19mpg 2008 estimates. So I guess using the 2008 estimates, your car is rated at 15mpg city, 19mpg hwy and 17mpg combined. |
Re: EPA MPG Estimates are Seriously Flawed
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I didn't explain myself too well in my previous post. The pre-hypermiling figures were from two years ago, when I first bought the car. The 22 mpg is from this month, I haven't kept records inbetween. Is there a particular formula for converting the "old" ratings to the "new"? I'm curious to see the different ratings for the life of this model. Thanks again, Pete.:D |
Re: EPA MPG Estimates are Seriously Flawed
Boy am I glad to see that link and that interpretation of data! I couldn't find that link anymore, and I really wanted a way to get some kind of estimates for my car.
It looks like you're using 75% of the rating from 81FG.DAT. From 80FG.DAT for the only LeSabre 4.1 listing I found: 100 4440 8030 6 17 23 20 794 252A3-1 6 4AY 17.3891 23.2655 19.6190( 4.1L) 7 LESABRE Looks like my 2008 EPA rating would be around 13 city, 14.5 combined, 17.5 highway. BRB putting that in my garage data... :D |
Re: EPA MPG Estimates are Seriously Flawed
I may be wrong about this, but I heard that vehicle manufactures base their MPG on a vehicle doing 55mph on flat ground. Which may be why under different conditions you get lower MPG.
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Re: EPA MPG Estimates are Seriously Flawed
Manufacturers base their MPG on the very specifically documented tests that the US EPA requires (and the EPA spot-checks to keep them honest).
https://fueleconomy.gov/feg/how_tested.shtml https://fueleconomy.gov/feg/fe_test_schedules.shtml |
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