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1000 miles on $30 of gas? #5404984 04/16/20 11:47 AM
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Burt Offline OP
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My MIL is turning 90 next month and I thinking about which car to take to make the 1000 mile trip, if and when they lift the stay at home orders. I'm tempted to take the Fiesta just for grins to see if I can make the trip on $30 of gas. Gas is currently $1.35 at Costco here. It's actually got pretty comfortable seats and a good radio, offset by a lot of road noise. But I was wondering whether its a good idea to run this little 3 banger ecoboost at 75 mph for hours on end?

I found a website that you can calculate hp requirements for a given speed and vehicle parameters. I input a drag coefficient of .38, 23 sq ft of frontal area, 2900 lbs loaded. It came back with the following HP numbers

50 mph = 11.8 hp requirement
75 mph = 31.7 hp
120 mph = 115 hp

Given the engine makes 126 hp before deducting transmission losses and it probably can't do 120, this is theoretical calculation is still probably ball park..

Then I calculated specific fuel consumption using the above info and knowing that the car gets 70 and 39 mpg at 50 and 75 mph respectively (I kid you not).
I got 0.0605 gallons per hp-hr at 0.0600 gallons per hp-hr at 75 mph. Perhaps plausible.

So 32 hp equals 25% of maximum output. Doesn't seem like its stressing the engine too much, but it does seem like 75 mph is the tipping point where the engine starts to sound like its working hard. And this is flat land hp, hills (and wind) will require more hp.

How much is too much in pushing an engine?


2011 RX350 63k miles
2015 Fiesta SFE eco-boost 35k miles
Re: 1000 miles on $30 of gas? [Re: Burt] #5404989 04/16/20 11:49 AM
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atikovi Offline
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I could do it for under $20 with one of my cars.

[Linked Image from fototime.com]

Re: 1000 miles on $30 of gas? [Re: Burt] #5405001 04/16/20 12:03 PM
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Ihatetochangeoil Offline
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So how do you MERGE onto an Interstate? (Don't even dream of passing uphill)

Re: 1000 miles on $30 of gas? [Re: Burt] #5405005 04/16/20 12:06 PM
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ragtoplvr Offline
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The makers run them on a track for hours at full throttle as part of proving the design. It will be fine, you may very well notice it runs better when you get back from your little Italian Tune Up.

Of course, change the oil first. Or not depending on who you want to believe. Use gas PEA additive and change oil when you get back, or not.

It will make no difference. Do however check the oil. And check it again at the first stop, sometimes this gets the oil hot and it gives up fuel and water, so you can go low.

and have fun.

Rod

Last edited by ragtoplvr; 04/16/20 12:07 PM.
Re: 1000 miles on $30 of gas? [Re: Burt] #5405007 04/16/20 12:08 PM
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mattwithcats Offline
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First, oil filter is listed as Fram 3614...
If you have room, a Fram 3600 or equivalent is same base, and bypass, only an inch and a half longer...

Second, check your tires.
Look on the sidewall for “Max Inflation”
While the ride will be rougher, if you inflate to 5-8 pounds under the max, you will get better mileage.

My Smart has 51 psi max tires, I put 44 rear, 37 front.
OEM pressure was 29....

Fill the coolant bottle to the “HOT” line, when the coolant is cold...


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Wix XP 51356 filter, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: 1000 miles on $30 of gas? [Re: Burt] #5405050 04/16/20 01:14 PM
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A_Harman Offline
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How much rpm is your engine running at 75 mph?


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: 1000 miles on $30 of gas? [Re: Burt] #5405056 04/16/20 01:20 PM
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racin4ds Offline
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LOL you honestly thing 75mph interstate cruising is bad for your Fiesta?? C'mon, they were DESIGNED for that. Its much easier on them than short trips and stop-and-go!

Do a fresh oil change and hammer down! Just do us all a favor and don't hypermile, most of us don't have time to wait on you taking 20mins to get up to the posted speed limit on an entrance ramp.


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
'13 Passat TDi SE+Nav
Re: 1000 miles on $30 of gas? [Re: Burt] #5405077 04/16/20 01:39 PM
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pandus13 Offline
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OP,
I did Chicago - Atlanta - Chicago in an '08 Toyota Yaris sedan with 2 adults, 2 kids and luggage.
No problem in the TN/GA mountains and it never run better.

Keep the tire pressure at 4-6 PSI more than mfg recommended (you don't need to feel everything on the road or ride like on iron wheels), choose large chain gas stations, use a pair of apple headset (just to plug in some of the road noise, but still be able to hear everything around you), have some sunscreen, good sunglasses (aren't you in Texas?), clean your windshield and have some fluid with you (bugs, dust).

Enjoy the view and drink enough fluids (but not that much to stop every 15 minutes). If you enjoy it, you can drive more, maybe even in one shoot.


16 Golf SportWagen
13 Mazda5
08 Yaris
04 Elantra
95 accent
95 mystique
97 concorde
Re: 1000 miles on $30 of gas? [Re: Burt] #5405083 04/16/20 01:44 PM
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No problem cruising at 75 in a modern vehicle all day. I think you can do it easy. And if not it’s only going to take a couple dollars more in gas.


2019 Ford Raptor
2017 Corvette Grand Sport
2017 Yukon XL Denali
Re: 1000 miles on $30 of gas? [Re: A_Harman] #5405087 04/16/20 01:52 PM
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Burt Offline OP
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Originally Posted by A_Harman
How much rpm is your engine running at 75 mph?


I'd guess about 2700.

I'm just thinking that this car seems in its element around town and gets better on city mpg than highway - I mean relative to larger cars, not in absolute terms. When I see the mpg drop so significantly with speed, it makes me wonder if the 3 banger is more loaded up.

50 mph = 70+ mpg
60 mph = 60 mpg
70 mph = 43 mpg (~?)
75 mph = 39 mpg


2011 RX350 63k miles
2015 Fiesta SFE eco-boost 35k miles
Re: 1000 miles on $30 of gas? [Re: Ihatetochangeoil] #5405091 04/16/20 01:59 PM
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Burt Offline OP
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Originally Posted by Ihatetochangeoil
So how do you MERGE onto an Interstate? (Don't even dream of passing uphill)


The HP-to-weight ratio is pretty similar to a normal car and in fact the turbo 3 cyl is lighter, more powerful and faster than the larger NA 4 cyl fiesta. Its just making a lot of hp from a tiny engine. As much HP per ci as a Ferrari, it just doesn't have many ci's.

Amazing what they do with technology in economy cars.


2011 RX350 63k miles
2015 Fiesta SFE eco-boost 35k miles
Re: 1000 miles on $30 of gas? [Re: Burt] #5405099 04/16/20 02:06 PM
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Originally Posted by Burt
Originally Posted by A_Harman
How much rpm is your engine running at 75 mph?


I'd guess about 2700.

I'm just thinking that this car seems in its element around town and gets better on city mpg than highway - I mean relative to larger cars, not in absolute terms. When I see the mpg drop so significantly with speed, it makes me wonder if the 3 banger is more loaded up.

50 mph = 70+ mpg
60 mph = 60 mpg
70 mph = 43 mpg (~?)
75 mph = 39 mpg


32 hp at 2700 rpm => 62 lb*ft of torque. That's pretty heavily loaded for a 1.0L engine. But that's the intent of engine downsizing.

According to the road load data in your original post, your car requires 11.8 hp at 50 mph, and 31.7 hp at 75. That's 168% more power required for only 50% more speed, but the car only loses 43% in fuel economy. The bsfc values you quote shows that the engine is running at about the same thermal efficiency, actually a little better at the higher power.


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: 1000 miles on $30 of gas? [Re: Burt] #5405111 04/16/20 02:14 PM
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JC1 Offline
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I think you should drive slower that 75Mph if you want to make sure you can do it with a max of $30. Does the car show you how many MPGs you are getting?


2015 Grand Caravan SXT Plus 0w-20 Pennzoil Ultra/Fram Ultra Filter
1997 Honda Civic CX 5w-30 PPPP/Fram Ultra Filter
Re: 1000 miles on $30 of gas? [Re: Burt] #5405112 04/16/20 02:15 PM
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WyrTwister Offline
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I try to air tires up to max stated on sidewall / better MPG . Never had any problem . If worried , check the oil level frequently .

I try to remember ( in town ) to check it every time I fill the tank .

Check the rubber ( hoses, belts , wiper blades ) before you start off . Do not forget air pressure in the spare .

Check all fluids .


Wyr
God bless
Re: 1000 miles on $30 of gas? [Re: Burt] #5405156 04/16/20 03:10 PM
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javacontour Offline
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I drove a 1.25L N/A Fiesta in Italy at speeds over 130kph (where I could get away with it) for the better part of a day and it seemed happy to do it.

People have been driving small displacement engines at high RPMs all over the planet for generations without drama.

You should be able to do this and as long as the car is filled with the proper fluids and the radiator is working to specification, nothing bad will happen to the car.

Depending on how loud it is, it may be harder on you than your car.


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