Thinking about a gallon of Gas

[ParknVibe]

Every one talks about miles per gallon. Well looking at and being upset about my last fill up and miles per gallon calculation, I wanted to know how many ounces of gasoline are consumed in a mile. One gallon has 128 fluid ounces in it. My last fill up was 10.14 galllons and I drove 195 miles. (Mixed driving). This came to be 19 mpg. I have a 2009 Vibe 2.4l engine with auto trans. So... 128 oz / 19 miles = 6.74 oz. per mile If I got the posted mpg 21 city and 28 highway 128 oz / 21 miles = 6.1 oz. per city miles 128 oz. / 28 miles = 4.57 oz. per highway miles Conclusion: A lot of onces of expensive gas per mile for a two minute trip.For those who want to know at 32 mpg. 128 / 32 = 4.0 oz. per mile

[joatmon]

also if you calculate miles per gallon, and multiply it by 0.425 you get meters per milliliterbut no matter the units, these cars should get better efficiency than your numbers represent. whether it's 19 mpg or 8 m/ml

[KITT222]

Dang. I'm at just about 4 oz/mi. Not bad, I'd have to say. There are plenty of ways to increase your MPGs (or oz/mi). Some very simple. Such as keeping the RPMs below 3000, not pounding the gas pedal, not speeding (I have found with my mpg gauge that at 60mph, you can get 40mpg atm w/ a/c on at 2000-2200rpms), not braking hard but instead slowing down way before the signal, avoiding signals, avoiding cities, and so on. Member J_TO_ENVY has a 2.4 w/ auto and has been getting about 29mpg, so you could ask her what she's doing.

[lovemyraffe]

I'm not complaining about it. I like my 30-32 mpg I get most of the time.

[djkeev]

Ounces, gallons, pounds, whatever per mile or kilometer.I really don't think that way.Here is what amazes me about a gallon of gas.My Son In Law has a newer VW Passat. Four cylinder, fuel injected, stick shift, turbo charged, air conditioning and all the creature comforts one desires. All this and the car gets 35+ mpg on the highway while delivering 200 horsepower, more than enough power to get out of the way as needed!!I collect and restore classic air cooled VW's, Beetles, Karmann Ghia's, and buses.My 1972 engine delivers 28 MPG, fuel fed via carburetor, stick shift, 4 cylinders and a whooping 40 Horse Power!! Far less power than needed to get out of anythings way!!The same gallon of gas, the same $$ spent for that gallon. It is staggering how by using modern computer technology the efficiency of that gallon of gas is multiplied 5 times!!! 40 vs 200 HP! All done while cruising in a high level of comfort!!THAT'S what I find amazing about a gallon of gas today!Imagine if VW had the technology available today back in the 60's and 70's, before tight pollution controls and government limitations on what can or cannot be done on the highway!Dave

[vibenvy]

Quote, originally posted by KITT222 »There are plenty of ways to increase your MPGs (or oz/mi). Some very simple. Such as keeping the RPMs below 3000, not pounding the gas pedal, not speeding (I have found with my mpg gauge that at 60mph, you can get 40mpg atm w/ a/c on at 2000-2200rpms), not braking hard but instead slowing down way before the signal, avoiding signals, avoiding cities, and so on. Member J_TO_ENVY has a 2.4 w/ auto and has been getting about 29mpg, so you could ask her what she's doing.Well, first off... a little more information on my Vibe... it's a 2009 GT with the 5-speed auto. The only engine mod is K&N Typhoon CAI with an AEM air filter. I use Penzoil 5W-20 and Toyota oil filters. The oil is changed every 2500 miles. It gets nothing but 89 octane gas from Citgo. When accelerating I try to keep the RPMs under 2500. Whenever I am driving on country roads and/or interstates, I set the cruise control at 55. That's pretty much it. I think keeping the RPMs low is what really makes the biggest difference. I started doing this within the past couple months and have seen an average of 28-29 mpg with 50% city/50% highway driving.Here is my MPG Tune page.Quote, originally posted by Ivibe »If I got the posted mpg 21 city and 28 highwayFYI... the EPA highway ratings for the 2009 2.4L are 29 highway, 21 city and 24 combined .

[ParknVibe]

Sorry, I always had 28 in the back of my mind. If I am correct, 28mpg is for a manual 2.4L engine. I started this thread because I wondered how much gas is required for just a one mile trip.I like to know what makes the 2.4l SO MUCH less efficient then the 1.8L engine. I believe that it could be the idle speed is set to high in drive. It looks like 800 rpm on the dash tach. I had older 2.5L 4 cyl and the driving idle speed was about 600 rpm.

[djkeev]

Quote, originally posted by Ivibe ».......I like to know what makes the 2.4l SO MUCH less efficient then the 1.8L engine. I believe that it could be the idle speed is set to high in drive. It looks like 800 rpm on the dash tech. I had older 2.5L 4 cyl and the driving idle speed was about 600 rpm. Well for starters, the 2.4 is 25% larger than a 1.8. That extra piston size and different design will decrease efficiency. It takes a given amount of explosive energy to displace a given size piston.How boring do you want to get here?the 1.8 engine produces....------------------ 2.4 engine132 hp @ 6000 RPM ------------------------- 158 hp @ 6000 RPM128 Ft Lbs @ 4400 RPM -----------------------162 ft lbs @4000 RPM26 MPG city ------------------------------------21 MPG city32 MPG highway --------------------------------28 MPG hwyAuto trans 1st 2.85 ---------------------------------------3.942nd 1.55---------------------------------------2.203rd 1.00 --------------------------------------1.414th .70 -------------------------------------- .73Rear axle standard 4.31 ---------------------------------4.31optional 4.23 --------------------------------- 3.39Lower gear ratio numbers deliver PERFORMANCE but cost MPG'sFor instance, in 1st gear the 1.8 engine rotates 2.85 times for one revolution of the output shaft. the 2.4 rotates 3.94 times for the same one revolution of the output shaft. Can you see where this might suck up fuel?? Gives you ZIP but at a cost.Then when you factor in rear axle ratio's, add tire circumference you begin to see where the fuel mileage differences come in.Simple fact, you want sporty power? You purchase more fuel. It's most often quite that simple.Dave

[star_deceiver]

Well.... If you've seen any of my youtube vids of me driving, you've just seen the way I drive most of the time on the highway!I don't hyper-mile. I don't drive 55. I don't accelerate slowly away from lights. In school zones I drive the posted speed. In residential areas I drive the posted speed or less if there are many parked cars. On the highway I drive about 10-15km/h over the limit. On the freeway.... I drive however I feel like driving. I have the 1.8L engine and 5 speed stick. My car has no options, not even A/C and weighs about 3050lbs with me in it. I use Toyota 0w20 full synth. At the moment there's TDH in the transmission (long story). Gas is cheap here, about $1.10-$1.15/L... it's funny watching people whine about so-called expensive gas when I see far more expensive things out there that people buy everyday (like buying Starbucks frapps with a credit card )At the moment I'm getting around 33-35mpg!If my main goal was to save gas I'd walk to work.... oh wait, I do...

[djkeev]

Consider this, NASA's Crawler Transporter which moves rockets from the assembly building to the launch pad travels about 42 feet per gallon of fuel, or simply put, 126 gallons per mile.The length of travel is 3.4 miles one way. The one way trip takes 8 hours. One mile per two and a half hours.It has two 2,750 horsepower diesel engines which power 16 electric traction motors.I've been there, I've stood next to it, this thing is MASSIVE!!! it has it's own gravel dual lane freeway to travel upon! you cannot even imagine how big this piece of machinery is.

[star_deceiver]

I believe the muffler on that thing's bigger the our Vibes!!!