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Questions tagged [fuel-consumption]

Use for questions related to fuel economy.

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Does a more powerful engine use less fuel for a specific load than a less powerful engine?

A colleague told me about a truck driving in the mountains. He said if the engine is too small, it would use more fuel to pull the truck up than if the engine were larger, noting the reason is the ...
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1answer
34 views

Premium vs plain gas consumption on long trip [duplicate]

I mostly ride my motorcycle on long trips distances of 200-250km with an average 100-120km/h speeds and using almost exclusively premium gasoline. My motorcycle is a Yamaha Fazer which does not ...
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1answer
34 views

Do cars manufactured after 2018 have an alternative more reliable fuel gauge?

This presents two reasons for standard fuel gauges' imprecision: In the sending unit, the fuel has to drop below a certain level before the float starts to drop. When the float is near the ...
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1answer
49 views

How can you guarantee that your rental car won't use unreasonably more fuel?

After more than 50 rentals, my grandpa and grandma have noticed that Enterprise CarShare's cars match manufacturer's advertised fuel economies, but Enterprise Rent-A-Car's are much lower: As an ...
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3answers
99 views

Would restricting air intake reduce fuel consumption?

I own a Yamaha YS125 which is fuel-injected, and a lot of times I am flogging the bike on full throttle, which increases fuel consumption. I was thinking of restricting the air flow intake of the ...
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0answers
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Mitsubishi Montero limited Have EXCESS FUEL consumption

My Fairly used Mitsubishi Montero limited 2000 model has excess fuel consumption like 30litrs per 100km Accompany with very hot interior under the feet even with a c on though vehicle not doing ...
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0answers
17 views

Sudden Oil consumption increase

There is increased oil consumption in a 2009 chrysler 300c that has the 5.7 Hemi motor .There are no oil stains on the garage floor .There is an apparent fuel consumption increase which we ...
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0answers
23 views

New plugs, but problems starting (not firing on all cylinders) and poor fuel economy?

Car is a '93 Mk1 VW Cabriolet, 1.8lt injected. The car has had trouble starting - feels like only some of the cylinders are firing. If I rev the engine a little the problem goes away after a few ...
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2answers
40 views

2007 Honda Shadow Aero 750

I have a 2007 Honda Shadow Aero 750. I bought it in 2014. (My first motorcycle) I have intentionally run it till I had to switch to reserve to check how many miles I can go on a full tank. The first ...
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1answer
58 views

Short term fuel trim shows -9% (Rich)

Honda Civic 2007 90km odometer Problem- Fuel consumption I have scanned my car and it shows STFT -9% along with below parameters. Coolant temp -> 64 LTFT -> -7.03 Oxygen sensor voltage -> .55v EGR ...
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2answers
30 views

Car Scanner tool and output

I am pretty green in this field. Recently, I have bought a Honda Civic 2007 and planned to investigate its condition out of my curiosity. I bought a OBD-II tool and scanned my car. To my surprise, I ...
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2answers
111 views

Relationship between torque, power, specific fuel consumption, and AFR

How does Torque, power, and specific fuel consumption change with AFR? And why is it so? I found graphs relating these in books as well as websites but I couldn't find any good explanations.I have ...
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1answer
96 views

Non-Turbo vs Turbo at Altitude and loss of power

I am going to be moving from sea level to 7,000 feet and at the same time replacing my 02 Accord with something else so I am looking around at all sorts of options. I know that at altitude an internal ...
2
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1answer
90 views

Diagnosing a p0420 code for 2005 nissan x-trail 2.5L

I own a 2005 nissan xtrail with a 2.5L engine (QR25DE). I have problems with my vehicle, too much fuel consumption ( 3.8km/L ) My car has a 60Liter tank , my last fuel up gave me 229KM until the ...
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1answer
110 views

Am having too much fuel consumption on my Toyota Carina e 1994 model. Please what is the causes?

Having high fuel consumption on my Toyota Carina e 1994 model. Please what may be the causes?
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1answer
45 views

Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

Currently, I'm working on an app which should show Gauge value (inHg) of the vehicle using OBD reader. Which values should I use to show the Gauge? Is there any formula?
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2answers
55 views

Will oil consumption decrease well before a check engine light tells you you have a problem?

I had a check engine light come on due to a o2 sensors which were giving a slow response but this was actually caused by a leaking flexi pipe which had been there for some time. This case can lead to ...
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1answer
26 views

Bajaj discover 125(2011model) runs like always giving reserve fuel warning even when fuel is sufficient

I have Bajaj Discover 125 (2011) model which has always been taken care by me. as i dont ride bike much it only ran upto 20,000 km till now in plains. (Punjab). Everything was fine and the bike ...
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2answers
799 views

Can an exhaust leak cause bad MPG?

One of the connections between the exhaust downpipe and DPF filter is leaking (I guess the gasket may be the problem). Recently the leak got a little bit more obvious, I can hear it when reving the ...
2
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1answer
56 views

Suddenly milage dropped and engine started working differently

I have suzuki access 125. Cc:125 Body Type: scooter Engine Type: single cylinder 4 stroke(SOCH) Fuel system: carburetor (ucal cv)(vm18-258 * i don't know what it means but found on ucal website) Fuel ...
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0answers
32 views

Car sometimes starts rough, almost stalls when coming to a stop, poor fuel mileage

I have a 2013 Chrysler 200 LX 2.4L 4speed automatic. Last summer it occasionally had difficulty starting. One in every few starts it would start rough. Now I've noticed recently it seems like it's ...
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1answer
139 views

08 altima burning through gas like crazy

2008 Nissan Altima 2.5s is burning through gas like crazy! Motor has 164k on it. I put in a half tank yesterday and I've only gone about 50 miles, 80% Highway and I currently have 36 miles remaining. ...
4
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1answer
64 views

Unusual fuel consumption

So I haven’t been driving for a very long time only about a year or so, and my car is an Eagle vision Esi 1994. I just replaced my inner and outer tie rods and put oil into the car, I haven’t had any ...
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0answers
23 views

Citroen C4 fuel consumption

I have a Citroen C4 2004 1600 with very high feul consumption, I have had it serviced recently, so the air filter has been replaced. I get about 11 litres on a 100 km. I'm looking for a reason exactly ...
2
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1answer
57 views

When I put in 5 liters, the gauge does not move. When I put in another 5, it does not move again. But it does if I put in 10?

Yesterday, the fuel indicator light was on. I filled it up with 10 liters, and the gauge moved visibly. Today, the light was on again. I fueled it up for 5 liters. No movement. Then I fueled it up ...
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0answers
50 views

Runing a lot of gas

I have a 2006 Dodge Durango 175,000 miles I had a fuel pump put in Feb of this year, but now I am burning a lot of gas. I have to fill up my truck every four days now. Before I could ride on a full ...
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1answer
1k views

Calculating current fuel level with obd data

My car does not provide the fuel level data to the obd. this is the data the car do provide: engine coolant temperature, engine load, ambient air temperature, engine rpm, intake manifold pressure, air ...
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1answer
245 views

Why don't automatic transmissions include Neutral in their range?

I have read the claim that modern automatic transmissions cut fuel to the engine on downhill stretches, thereby making it more fuel efficient to go down a large hill in drive than in neutral. However,...
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1answer
61 views

2001 Vw beetle 02 sensor car will not go over 65mph

I have a 2001 vw beetle 2.0 engine with 171,000 miles on it. I have a check engine light on saying that bank 1 lean. It has been like this for years and I have had no problem with it. Yesterday I ...
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3answers
5k views

How do the latest automatic transmissions match the efficiencies of manual gearboxes?

Most people know that for old or even somewhat old cars, manual transmissions are more efficient. Recently automatic cars have become almost as efficient or even as efficient as manuals. I was ...
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1answer
32 views

Fuel Economy Calculation

There are 2 possible routes in the morning. A 19 Mile route (which is mainly motorway). Average speed is 60 Mph and the average mpg is 45. Or a 11 route, flat ground but it's mainly city so the ...
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1answer
1k views

How does a tire's diameter and width impact fuel economy?

In lifted 4WD trucks using much larger tires, owners say they often see a decrease in fuel economy. This leads me to wonder, how does tire size (specifically, outside diameter) affect efficiency? In ...
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0answers
60 views

Suspected slow leak in carb, mileage low only when time taken to consume fuel

I have a weird mileage issue in my CB Honda Hornet motorcycle. This is a version specific to India, https://auto.ndtv.com/honda-bikes/cb-hornet-160r It has a 160cc engine. During the first 1000 Kms, ...
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1answer
652 views

Wheelwell smokes upon acceleration

I have a 1998 Nissan Maxima. It feels as if someone's holding the car back and smoke comes from front right wheelwell after accelerating. It's also getting terrible gas mileage. Is this a brake ...
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1answer
672 views

My Toyota Corolla 2009 Le 1.8l fuel consumption too high

I run my car in normal use in highway and no traffic I spend $20 full tank 90 miles I replace my tires,spark plugs Oem ,Transmission fluid with filter,Engine oil with filter,Thermostat,antifreeze,Air ...
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0answers
150 views

Valves calibration vs fuel economy

My new hobby car (Fiat 126p, 2 cyls air cooled, rear mounted) is not doing correct fuel economy. Spark plugs looks ok. Fumes, at cold start are black but as it warms up, it looks ok. The only ...
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2answers
70 views

Bad fuel efficiency and suspected sticky / dirty injectors

The fuel efficiency on my 99 Nissan Almera 1.6L MTX has always been a bit below what I would expect, and the idle has gotten a bit rough lately, so I started poking around with a scope to see what I ...
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0answers
260 views

Cars with single fuel type how retrieve tank level to dashboard?

I see that BiFuel cars had fuel level and type readable from ECU by using pid 0151 and 012F. Cars with monofuel don't have this pids sensors, so how the dashboard retrive the fuel level? Maybe the ...
2
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1answer
668 views

2009 Honda CRV - increased fuel consumption

My 2009 Honda CRV seems to be getting worse than normal fuel efficiency. The gas bars disappear quicker than it used to. I have tried the following: New spark plugs New air filter Oil change A ...
3
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2answers
68 views

Is there a simple metric to compare tire lifespan?

Companies with a fleet of vehicles (taxi, limo, etc) think of car tires as a cost that cut into their profits. For this reason, it's best for them to buy the cheapest tire for the same expected ...
5
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2answers
4k views

How read/calculate the amount of consumed fuel estimated for a travel?

I read some Question like that but the best that i found is to fill the tank and read how many km you can do with that tank and register it. But i'm developing an application that read information ...
4
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1answer
131 views

Fuel consumption jumped by 40% overnight

I have a 2012 Diesel (1.6 112 HP) Ford C Max. Last Monday, I noticed that fuel consumption jumped by 40% ! In the beginning, I was blaming some cold weather that day. But then, the temperature ...
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0answers
92 views

Fuel consumption problem

Morning I have a Toyota Corolla LE 2004 model, it consumption level is very high as in 50lt can finish in 2 day from my office to back home with is a 15 minute drive. I have scanned the vehicle ...
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votes
4answers
449 views

Where is extra fuel consumption in RWD and AWD cars dissipated?

I have understood that rear-wheel drive (RWD) and all-wheel drive (AWD) cars are less fuel efficient than front-wheel drive (FWD) cars, and that for this reason most cars sold today are FWD. I'm ...
2
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2answers
264 views

Does a black car have worse fuel consumption?

As we all know, in hot climates part of the engine's output goes to power the AC compressor. Now, in such a climate, if your car is painted black, it should absorb more sunlight, and therefore, ...
4
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2answers
687 views

Mazda3 2013 Skyactiv-G 2.0, after 3 years using 5w40 is it Ok to lower the grade (thinner oil like 5w20 or 0w20) as recommended by manufacturer?

Context Mazda 3, US version, model 2013, Skyactiv 2.0 engine, gasoline, hatchback, manual transmission. I got the car from the US with 24,000 miles and 0w20 Penzoil full synthetic on it, according ...
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0answers
29 views

Consumtion of fuel

I've a mazda cx7 2011 model, I used it most for long distance drive, 99% of the long distance drive is the same region to the other region. At first when i fill the tank and i take off the journey I ...
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4answers
1k views

Does SUV cars consume more fuel than sedan cars? [closed]

Does SUV cars generally consume more fuel than sedan cars ? Especially at high speeds (more than 60 km/h). If yes, is the difference significant ?
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1answer
99 views

Which is better when driving at 60 kph? [closed]

For a flat road with a maximum speed limit of 60 kph, which would be better for a 2.4L 4CYL i-VTEC gasoline engine (K24A4 rated at 160HP @ 5500 rpm, 218Nm @ 4500 rpm): 3rd gear at 2500 rpm 4th gear ...
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0answers
66 views

07 Camry Engine slow RPM and excessive fuel consumption reading

I have 2007 Camry manual made in Australia for Arabic gulf. The engine sometimes go to 500 rpm and suddenly stops. Or it also goes to 1500 rpm and doesn't return to 1000 rpm (which is the normal as ...