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Old 04-21-2012, 11:28 PM   #801
raptor1956
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Quote:
Originally Posted by suss6052 View Post
Assuming you lived someplace perfectly flat and level, add in any hills/ grades then the weight is doubly important, because the rolling resistance is combined with the grade resistance which increases the road load force exponentially with increasing grade angles.
I do live in the mountains (Salt Lake City), but if you're not nursing the brakes the extra gas you use to up the hill pays for itself going down the other side. Again, if you're nursing the brakes on the downhill side then the weight penalty would come into play, but since that seldom happens to me (I'm not driving a TT) then I'm not wasting energy in the brakes.

Onc of the steeper roads in my area is I-80 going west from Summit Park towards SLC. Going up that hill I have to drop down from 5th to 4th and even 3rd to maintain 75mph but I can coast down it without touching the brakes unless some chucklehead gets in my way.

Weight is a bigger penalty in city driving for two reasons: rolling resistance more important at lower speeds, and starts and stops cause you to waste energy with the brakes -- one of the main reasons why hybrids do much better in city driving and only a little better on the highway.


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Old 04-22-2012, 01:16 AM   #802
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just drove 150 highway miles today, to one city and back, lots of big hills between the cities, I was cruise at 59mph and got on average 47mpg (only highway miles). With driving in a really hilly city i get about 31mpg (average speed is about 28-30 mpg through the entire tank). So far i am very pleased, so much better than my old jeep, average was about 12-16.
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Old 04-22-2012, 09:58 AM   #803
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Fuelly calculated 42 mpg my last tank!! Amazing.
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Old 04-22-2012, 10:06 AM   #804
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In my experience, going 70 kills your MPG. Keeping it at 60-65 has resulted in consistently getting 38-40 MPG combined.
That's what I thought, yet my 45 mile round-trip commute is on a 55mph highway so I set my cruise for 60. 1 week of driving to work and back, 100% highway and never going over 60mph gets me ~32-33 :(
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Old 04-22-2012, 10:23 AM   #805
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That's what I thought, yet my 45 mile round-trip commute is on a 55mph highway so I set my cruise for 60. 1 week of driving to work and back, 100% highway and never going over 60mph gets me ~32-33 :(
Odd. Was it windy? Are your tires set at the correct pressure? Was the road hilly? Using cruise control on a hilly road could actually hurt your mpg.

Other than that, I just don't know.. How many miles do you have?
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Old 04-22-2012, 10:54 AM   #806
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Just drove 388 miles yesterday, 70+ mph, had great tail wind.
Air pressure in tires below max cold air, 46-47psi, with 5 speed manual I coast when I can in neutral, down some hills and approaching stops.
40 mpg!
I can't get that with a head wind.
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Old 04-22-2012, 10:55 AM   #807
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34.015 MPG second tank

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Originally Posted by Focus YBTC View Post
Second tank, I was at 34.8 to 35.2 for around 200 miles then I had some bouts of enthusiastic driving hit and now it's down to 33.5 MPG. First tank was calculated by actual miles driven divided by gallons used, the display actually gave me a slightly worse number. The second tank I'm going by the display alone until I fill up again.
Again, it was better than the display said, that told me I was getting 33.5 MPG and I actually got 34.015 MPG if I can believe the gas pumps and miles driven reported by the trip meter on the car. Interestingly it was relatively warm when I filled up (mid 60s) with low winds and I drove 45 miles directly after the fill-up and parked it with the display reading 37.3 MPG. Yesterday it was cool (low 40s F) when I started driving the car and in less than one mile my 45 miles driven average MPG fell from 37.3 to 34.2. I've noted how much fuel this car uses when cold so today I'm trying my engine block heater to try to pre-warm the engine. It's currently in the mid 40s F ambient temp. and the block heater uses 448 watts of electric power according to my Kill a Watt power meter and it's been heating for an hour and a half.

The manual says the following about the block heater.

Quote:
How to use the engine block heater

Ensure the receptacle terminals are clean and dry prior to use. To clean
them, use a dry cloth. Depending on the type of factory installed equipment, your engine block heater will use .4 to 1.0 kilowatt-hours of energy per hour of use. Your factory installed block heater system does not have a thermostat; however, maximum temperature is attained after approximately three hours of operation. Block heater operation longer than three hours will not improve system performance and will unnecessarily use additionalelectricity.

Make sure system is unplugged and properly stowed before driving the
vehicle. While not in use, make sure the protective cover seals the
prongs of the engine block heater cord plug.
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Old 04-22-2012, 11:12 AM   #808
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Given my commute, I have been very happy so far.

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2012 Grey Focus SE - Sports, Winter, Moonroof, Sync/Sirius
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Old 04-22-2012, 11:31 AM   #809
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Originally Posted by Dollar Bill View Post
Air pressure in tires below max cold air, 46-47psi.
I bet it felt like you were floating on air.
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Old 04-22-2012, 02:17 PM   #810
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I bet it felt like you were floating on air.
Almost like helium with the tail wind.
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