Last post on Jan 13, 2012 at 9:25 AM
You are in the Hyundai Sonata
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Hyundai Sonata, Sedan
#271 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [so [moocow1]
May 26, 2008 (9:29 am)
The difference in gas mileage between 55 to 70 isn't really that much for most cars with decent aerodynamics.
I have to disagree with that as a general statement. My 2004 Elantra AT is quite aerodynamic for a compact car. There is a significant difference in mpg at 55 vs. 70. At 55, the engine is loafing at around 2000 RPMs, and can easily get near 40 mpg on level ground at that speed. At 70, the RPMs are around 2700 (I forget exactly how fast) and mpg drops to around 35 mpg on level ground. I have found similar behavior on every other car I've owned over 30+ years.
There is discussion in the press about resurrecting the 55 mph national speed limit, to save gas. Already some states are dropping their speed limits.
On a long trip, I can see the benefit of going 70 vs. 65. On around-town driving, I think the gas savings in slowing down far outweigh the little bit of time saved. I did a test once. I drove a route I frequently travel across town, mostly on an urban freeway but with some city streets and stoplights too, about 7 miles total. On the way to my destination, I drove the speed limit (55-65 range) on the freeway and tried to use as light a foot as possible on the gas, considering conditions. On the way home, I drove much more aggressively, went 5+ over the speed limits, didn't pay any attention to how hard I was pressing on the pedal, and sped away from stoplights. I got about 24 mpg. I also saved a whopping 1 minute on my trip.
#272 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [ba
May 26, 2008 (1:07 pm)
The sonata's gearing is built for higher cruising then because 70mph = 2k rpm or so. And I've been getting 30-35 mpg on freeways so there's definitely no complaint about fuel economy so far.
#273 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [ba [moocow1]
May 26, 2008 (1:20 pm)
Have you tested the FE at 55 and at 70 mph, on level ground? I'll bet you'll find there's a significant difference. Maybe with that 5-speed it'll run 1500 RPMs at 55.
#274 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [backy]
May 26, 2008 (3:52 pm)
When the 55 MPH national speed limit was forced upon us, my car at the time was a '71 Volvo 1800E, 4 speed + electronic overdrive. (4 cyl, 121 cid, 130 hp). Engine revs were the same at 71 MPH in overdrive as they were at 50 MPH in 4th gear. At 55 mph I couldn't use overdrive as the revs were too low and would foul the engine (had to keep the revs 2K when maintaining speed).
I think your example of an aggressive driving test is more an example of accelerating, braking, accelerating, etc, rather than driving at a relatively steady speed.
Back to my great old 1800E, on a highway trip of 350 miles (notwithstanding wind resistance) it just seems that 5 hours at 70 mph vs 7 hours at 50 mph would result in better mpg at the higher speed in the higher gear.
#275 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [20
May 26, 2008 (4:08 pm)
"In IL you would get a ticket for impeding traffic. Drive the speed limit, or get off the road."
Well I don't live in IL, I live in TX and the speed limit here is 60 mph. Driving 5 mph under that limit is hardly impeding traffic. It's called a "speed limit" for a reason, meaning it's the fastest you're legally allowed to drive. It doesn't mean you have to drive that fast. I wouldn't care if the speed limit was 65 mph, I would still drive 55 mph. As far as I'm concerned as long as I'm in the far right lane, if you don't like how fast I'm driving then go around me. I'm not going to speed up and waste my money to accommodate some impatient motorist behind me in a big rush to go nowhere.
Hey, if people want to go flying around at 80 mph wasting gas that's their prerogative. However for every mile per hour faster than 55 mph, fuel economy drops by about 1 percent, and the drop-off increases at a greater rate after 65 mph. So with gas prices dangerously close to $4.00 a gallon I will take every bit of gas savings I can get. And if it means driving 55 mph instead of 80 mph and taking a little longer to get to my destination, then so be it. Unless you work in a job that requires you to drive, then time does not equal money. My priority now is to save money on gas, and I will do everything I can to make that happen.
#276 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [backy]
May 26, 2008 (5:16 pm)
I honestly don't believe and I hope the 55 limit does not come back. Montana is a big state with lots of road between cities.
Pray people.....pray to the gas gods.
#277 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [craigbrooks]
May 26, 2008 (5:31 pm)
I hope not either, at least not on the Interstate system in the bigger states. I lived in TX so I know what you mean about lots of road between cities.
But speaking of that 2009 Sonata... that would be a nice car to take on a cross-country cruise, huh?
#278 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [ba
May 26, 2008 (9:43 pm)
I picked up my 2009 I4 LTD two days ago and absolutely love it. Black with camel interior...the charcoal interior just didnt do it for me. Took it on a mini road trip and was surprised at how smooth and elegant the I4 is. Thought about getting the v6 but didnt want to part with the extra coin. Been drooling over this car for a couple of months and couldnt be happier with the purchase. This is a major improvement over the previous versions of the Sonata and Im so glad I didnt buy one last year but waited for the refresh. And, Backy...I am taking mine on a cross country trip in July...cant wait!
#279 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [20 [dgs4]
May 26, 2008 (11:35 pm)
Wow, what part of TX are you from? Curious as I see the speed limit as anywhere from 60 to 80 MPH, with the bulk of the highways being 70 MPH, even in town the speed limit is 65.
#280 of 1195 Re: Hyundai 2009 Sonata Break-In Period CONFLICT with Auto Transmission [ba
May 26, 2008 (11:42 pm)
Unfortunately I am not the type to ever do that test. I prefer using my car to get where I need to go. Maybe someone else here can spend some time testing between those speeds.