speeding along at 72 mph on I70 with a 2010 Prius

Discussion in 'General' started by waltermlee, Apr 13, 2012.

  1. waltermlee

    waltermlee Well-Known Member

    speeding along i70 westbound through pa oh il in ... psi 38/36 no grill blocking
    temp 60 f sunny dry going 70 to 77 mph ... scangaugeii mpg reads 39 to 49 mpg avg 45
    cant go any slower too much traffic
    pa mountain climbs require prius ice to go up to 3.8 gph
    - prius engine works very hard just to go 38 mph uphill

    hypermile along I40 in Pa but passenger side mirror clips road construction barrier
    mirror shatters - need to repair... sigh :(
  2. ALS

    ALS Super Moderator Staff Member

    My Prius has never seen any speed higher than 62 mph or 100 kph.

    I'd want to cry if I was only getting 45 mpg on the highway with my Prius. :(

    If I want to drive 70 mph on the Interstate that is what the Volvo is for.

    What most people don't understand is, as you increase your speed the higher the possibility of paint being chipped on the front bumper and mirror assemblies by the road garbage kicked up other vehicles around you. My body guy told me this one a few years ago. He could always tell who was a speeder and who drove the speed limit just by looking at the mileage on the odometer and the damage to the paint on the front end of the car. BTW just for reference to remove your front bumper cover, paint it and reinstall it is between $500 and $600. :eek:
  3. lightfoot

    lightfoot Reformed speeder

    In heavy traffic, people slow down instinctively, making it EASIER to go slower, as long as you stay in the right lane. In lighter traffic there are more speeders but it's simple for them to change lanes and go around you. Medium traffic is more problematic. But I have yet to find a traffic situation that FORCED me to go faster than I wanted to (usually 50mph).

    But this is good data for the effect of speed on mpg in the Prius.
  4. diamondlarry

    diamondlarry Super MPG Man/god :D

    The only time my Prius saw 70+ mph was once when I was coming into Cincinnati, OH on I-74 and there was a pretty big downhill stretch. I had lifted off the throttle completely and was quickly approaching 8 bars on the pack battery. 45 mpg in my Prius would be like a really bad day for me...in winter.:p
  5. RedylC94

    RedylC94 Well-Known Member

    When you're on a busy Interstate doing 50 mph and all the other traffic, including the semi behind you in the right lane, is doing 70+, that may not literally FORCE you to speed up, but it's so intimidating as to have almost the same effect.

    Most of the Prii I see on Interstates are speeding about as fast as everybody else.
  6. herm

    herm Well-Known Member

    As I have said before. you dont need to feel intimidated with the right bumper stickers..
  7. JusBringIt

    JusBringIt Be Inspired

    Forced to drive 77mph? ha. The highest speed limit you will see in NYS is 65mph, and I never feel pressured to go above 50mph. I'll go up to 55mph however. That said... What kinda speed limits are you talking about? Do they have 80mph speed limits on those highways? I really do doubt that.

    I suspect the speed limit is closer to 65mph, and I can't see how you would be "forced" to go over 65mph..unless you consider "passing" to be this ominous force that makes you have to drive in an illegal manner. Think about this.
  8. MaxxMPG

    MaxxMPG Hasta Lavista AAA-Vee Von't Be Bach

    For the first 10 or 15 miles of westbound I-80 as you enter PA, the limit is actually 50. Then it goes to 55mph and then goes to 65mph near Camelback. I drive at 50, 50, and 50, respectively. On the Properly Inflated OEM three-season tires, I am above the 39-49mpg range along that stretch of '80.

    If anyone wants to approach at 70+ and rearend me, they may want to know that I have several starving attorneys on my speed dialer, and I will be happy to relieve the offending felon of all their assets. The road belongs to all drivers who retain their driving privileges, and on any multi-lane interstate, drivers have no right to require cars ahead to increase speed. If they do, then I have an equal right to require them to reduce their speed, and the two cancel each other out. If they don't like it, they can run for governor and legislate an increase in the speed limit.
  9. EdwinTheMagnificent

    EdwinTheMagnificent Legend In His Mind

    I got a ticket for doing 77 in a 65 in Ohio. This was years ago........ today I can't imagine ever having to go that fast.
  10. lightfoot

    lightfoot Reformed speeder

    There shouldn't BE a semi on your tail. You should have seen him coming up behind you and popped on your haz flashers while he still had an opening in the next lane to the left to shift into. This works at least 90% of the time. Sometimes a car or truck in the next lane over will see the flashers, figure it out, flash their headlights, and leave space for the semi. [Who says drivers in the NE aren't polite??]
    I usually flash the semis back into the right lane with my headlights once the trailer has cleared me, just to maintain a state of zen on the roadway.
    Normally I don't bother doing any of this for straight trucks because (a) it's easier for them to change lanes and (b) many of them can't figure out flashers.

    Correct. Obviously you haven't seen me on the road. I'm the Prius with CT plates ("MO MPG") puttering along in the right lane at 50mph.
  11. rfruth

    rfruth Well-Known Member

    It crackes me up when someone says they have to drive fast or they'll be run over - a neighbor of mine drives 75 on the highway then can't figure out why she needs a windshield at 20 K miles :rolleyes:
  12. diamondlarry

    diamondlarry Super MPG Man/god :D

    I know right? I've heard stories that you'd get run over in Chicago if you "only" drive the speed limit. I've found otherwise as I have driven 45-50 there lots of times and have never felt my life was in danger.:rolleyes:
  13. lightfoot

    lightfoot Reformed speeder

    Exactly. I used to drive 80-85mph in my Subaru, and the windshield got so pitted it was really hard to see through when heading into the sun.

    But it's true that having traffic come up from the rear can be upsetting until one gets used to it. When I was speeding, I didn't have to worry much about traffic behind me because only a few people were going faster than me!
  14. waltermlee

    waltermlee Well-Known Member

    DARCARS Toyota of Silverspring (MD) initially quoted $519 to fix the shattered passenger side mirror - my 21st Century Insurance Adjuster says she'll talk them down to $368 to fix the shatter side mirror ( I have a $200 deductible ). The passenger side mirror clipped those bendable road construction barriers in PA (alt-I40) and it shattered the mirror (but the passenger side mirror body/casing looks okay and motor unit is still working). I have some rewards cash on my Toyota Visa that I hope will lessen the pain at the repair shop...

    The total trip length (for HyperDrive 1) was 1962.8 miles which was between St. Louis Missouri to Washington DC Metro Area. It was a mistake to take detours to shorten the trip near WV-PA-MD that the Garmin GPS was advisng - if I had stayed on I-70 the drive would have been longer but easier to do. The Garmin GPS does not realize that local roads are no only slower but often have more traffic to work around. The detours that the GPS advised also had more construction sites that I had to drive around. The Prius was travelling between 82 mph to 68 mph on I-70 along Indiana-Illinois-Ohio-WV-PA-MD with the cruise control often set to 72-77 mph (GPS said it was 71-75 mph). For most of I-70 , the posted speed limit is 70 mph - but if I was not pressed for time I could have gone on the 65 mph truck lane and gone a bit slower. However, I had to make each trip (24 hours for each direction) in a day. I had a funeral to go to in St. Louis on Friday and then I had to return to Washington DC to attend another funeral on Sunday - so I had to trade fuel efficiency for time. The tire pressure for my stock Yokohama Avid S33D were set to 38 psi front and 36 psi rear. The driving temperature was over 60 F so I remove all my grill blocking. On the way to St Louis the weather was sunny and the roads were dry but it was cool enough so I didn't need to turn on the AC. On the way back to DC - the weather was horrible and it rained all day long and the roads were wet all the time ( I also had to use the defroster to clear the windshield several time). Over the +14 hours in each direction, I took multiple breaks to rest and I used cruise control most of the time. The trip required 40.263 gallons of 87 octane gasoline ( average price was about $3.90 per gallon). My overall fuel efficiency for this marathlon was 48.75 mpg (calculated average over several fill ups) which was composed of about 95% highway driving and 5% city driving so -- which is on par with EPA highway estimates.

    Because of the extended mountain downhill grades, the Prius Traction Battery State of Charge (SoC) got has high as 75%. At one point when the SoC was greater than 70% the cruise control would not work ( initially I panicked thinking I broke something) but then I noticed the Prius aggressively running the electric motors and I realized that CC was not likely to be permanently broken but only temporarily disabled until the Prius could use up the HV battery's excessive charge. It was a very strange feeling going +50 mph on a very long downhill grade with only the electric motors on... its not a something that's in the driver's manual or something that I've read might happen which is why i panicked initially...when the SOC drop down to 66% the cc was back online again. I like the familar - no surprises... yeah that's me - I fear change...

    The Ohio State Highway Police was very active about enforcing the speed limit along I-70... I saw alot of vehicles getting tickets along that leg of my trip. After getting the one finger salute for going 77 mph on the left lane of I-70 (with a 70 mph posted speed limit)- I realize that anything under 80 mph is considered slow on I-70.

    The Harbor Freight Tools high volume air compressor that I got for this trip lost its rubber feet during this trip. I guess I should nt be all that surprised that the compressor's flimsy plastic-rubber feet would break off since it costed only $22 dollars. While I'm disappointed it is not that durable, I am pleased that it does reinflate the tires quickly.
    Last edited: Apr 17, 2012
  15. ALS

    ALS Super Moderator Staff Member

    48.75 mpg at those speeds is nothing to complain about with the Prius.
    Hell I use that much fuel in my Volvo for an 1175 mile drive to Florida. :(
    Last edited: Apr 17, 2012
  16. chilimac02

    chilimac02 Bible Professor & Minister

    Texas Roads might make you feel that way (like you'll get flattened). It takes getting used to. Now I rarely go over 65, but that's because Big Blue likes it around 50-60, with anything over 65 requiring 4 or 6 cylinders.
  17. bestmapman

    bestmapman Fighting untruth and misinformation

    Pump your tires to max sidewall and make sure your are in the optimum highway mode. Use the hsi to optimize your downhill and flat segments and you'll get slighty above or right at 50 mpg at those speeds.

    Umm.....don't ask me how I know. I will admit nothing.
  18. EdwinTheMagnificent

    EdwinTheMagnificent Legend In His Mind

    Jutsin , does that mean that at 60 mph the Pilot is running on three cylinders ? Nice.
  19. SentraSE-R

    SentraSE-R Pishtaco

    lol. I'm averaging 50.2 mpg over 2400 miles on my trip from CA to NM in my boxy Scion xB, and I beat this Prius.
    Date          miles     gal      mpg          notes
    4/29/2012	212.7	5.199	40.91171379	home to reno	reno
    4/29/2012	328.1	5.823	56.34552636	reno to ely	ely
    4/30/2012	428.8	8.448	50.75757576	Ely to moab	Moab
    5/1/2012	335.3	6.576	50.98844282	Moab to Chaco to Farmington	Farmington
    5/16/2012	499.9	9.996	50.010004	Chaco local	Albuquerque
    5/23/2012	388.8	8.184	47.50733138	Chaco local	Cuba
    5/25/2012	242.8	4.321	56.1906966	To ABQ& back	Cuba
            	2436.4	48.547	50.18641729		

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