GX Fuel Capacity

[Curtis]

Yesterday I took My '07 GX's fuel guage down to its emptiest level to date (one square from the bottom with the fuel light on for about 10 miles). It only took

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[Curtis]

Re: GX Fuel Capacity

The most I have ever got on my '99 is 5.51, at the CE station in Garden Grove. I have heard that the newer GXs have larger tanks, and heard that they are the

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[Curtis]

Re: GX Fuel Capacity

7.4 GGE at the Diamond Bar station.

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[Curtis]

Re: GX Fuel Capacity

I find pump #1 in Burbank delivers the best fill. I noticed most of the CE pumps stop at about 87% and then after a short fill cycle jump to 100%. Pump #1

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[Curtis]

Re: GX Fuel Capacity

I have the same numbers for my 05 (about 5 to 5.5 GGE max). I find I seem to get about 30 to 40 more miles on a slow “PHILL” you don’t have near the temp

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[Curtis]

Re: GX Fuel Capacity

I've had the same experience -- no more than 6 GGE now matter how empty the tank was. On slow fill, there are no gauges or counters. It just runs until full.

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[Curtis]

Re: GX Fuel Capacity

The most I have ever got on my '99 is 5.51, at the CE station in Garden Grove. I have heard that the newer GXs have larger tanks, and heard that they are the

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Most years of the GX tanks are 8gge. You are probably aware that there is a phenomenon called "heat expansion" that occurs as the compressed gas expands into the fuel tank, causing it's pressure, and temperature, to rise slightly. The heated gas takes more space in the tank than colder gas, thus reduces the amount of fuel that can be delivered. On the other hand, the Phill is a slow fill and eliminates this, thereby allowing an extra gallon or so into the tank.

Keeping this in mind, if you fill up when the weather is cooler (morning or evening) you'll get more fuel. If you fill up, let the fuel cool back down for 10 minutes or so, then hit it again, you'll be able to add another gallon (approx).

Another factor is compressor pressure at the public stations. If I set the pressure on my station to 3600 psi, It will usually deliver 2800-3200, depending on temperature. In the summer time and slightly less than 3600 psi in the winter. In the Summer, I turn the pressure up to 4500 psi and everyone is happy, so I tend to leave it there year around now. Many of you have used stations that show 4000 psi, and I never hear you complain about the fill. By the way, the most I've gotten in a tank (ran it out of fuel) was 6.7 gge.

Remember these little tips and you'll figure out how to get the best fills, and best range in your cars. Happy motoring!

[Timon]

Re: GX Fuel Capacity

The tanks are designed to be over filled. The temp in the tank when filling can reach over 100. Once the tank cools back to 70 the pressure will drop to around 3300. If you over fill by a few hundred psi it will end up at 3600 when it cools. It's too bad that they never designed the pumps and tanks to allow them to talk to each other. That way the pump could read the tank temp and adjust. Oh, well.

[CNG MOTORS]

Re: GX Fuel Capacity

I am aware that Honda advertises all the GX's as having 8 GGE tanks. I have purposely tested this in several model years by running the car completely drying and then towing to a CNG station that I trucst is accurate. Everytime it took between 5.995 - 6.005 to fill up. I've done this with a 99, 00, 04, and 06. They all also ran out of gas right at 240 miles or a mile or two after that. This was all freeway driving with the cruise set on 75 mph.

I will soon be offering extra tank installs for GX's owners at the cost of about $2500 in the next 3 months. These will be new type III tanks and will be an additional 6.5 gge giving you a total capacity of 12.5 gge in your GX. Should be good for 400 - 500 miles based on your driving. You will lose your remaining truck space and your spare tire. I would also recommend stiffer after market springs for your suspension because the weight will make it squat about 1 inch in the rear. And of course if you buy the GX from me the price will be cheaper than that (my cost). We will do the install for you. So they car must get to Phoenix somehow.

I currently do installs of extra tanks for new customers for $500 (my cost) but these are used tanks and 3.5 gge.

I may offer a new type II tank install 3 gge for $1250. It will depend on demand.

[cman]

Re: GX Fuel Capacity

I recently ran into a situation where I had to drive on low fuel in my 08' GX. I drove for 38.9 miles with the gas light on before making it to the nearest pump. I never did run out of gas.

[jdelect]

Re: GX Fuel Capacity

I am aware that Honda advertises all the GX's as having 8 GGE tanks. I have purposely tested this in several model years by running the car completely drying and then towing to a CNG station that I trucst is accurate. Everytime it took between 5.995 - 6.005 to fill up. I've done this with a 99, 00, 04, and 06. They all also ran out of gas right at 240 miles or a mile or two after that. This was all freeway driving with the cruise set on 75 mph.

I will soon be offering extra tank installs for GX's owners at the cost of about $2500 in the next 3 months. These will be new type III tanks and will be an additional 6.5 gge giving you a total capacity of 12.5 gge in your GX. Should be good for 400 - 500 miles based on your driving. You will lose your remaining truck space and your spare tire. I would also recommend stiffer after market springs for your suspension because the weight will make it squat about 1 inch in the rear. And of course if you buy the GX from me the price will be cheaper than that (my cost). We will do the install for you. So they car must get to Phoenix somehow.

I currently do installs of extra tanks for new customers for $500 (my cost) but these are used tanks and 3.5 gge.

I may offer a new type II tank install 3 gge for $1250. It will depend on demand.

Hi Murphy are you going to offer the 3 gge tank for the gx and if installed in the trunk will the spare be able to be used?
Joe

[taz]

Re: GX Fuel Capacity

Most years of the GX tanks are 8gge. You are probably aware that there is a phenomenon called "heat expansion" that occurs as the compressed gas expands into the fuel tank, causing it's pressure, and temperature, to rise slightly. The heated gas takes more space in the tank than colder gas, thus reduces the amount of fuel that can be delivered. On the other hand, the Phill is a slow fill and eliminates this, thereby allowing an extra gallon or so into the tank.

Keeping this in mind, if you fill up when the weather is cooler (morning or evening) you'll get more fuel. If you fill up, let the fuel cool back down for 10 minutes or so, then hit it again, you'll be able to add another gallon (approx).

Another factor is compressor pressure at the public stations. If I set the pressure on my station to 3600 psi, It will usually deliver 2800-3200, depending on temperature. In the summer time and slightly less than 3600 psi in the winter. In the Summer, I turn the pressure up to 4500 psi and everyone is happy, so I tend to leave it there year around now. Many of you have used stations that show 4000 psi, and I never hear you complain about the fill. By the way, the most I've gotten in a tank (ran it out of fuel) was 6.7 gge.

Remember these little tips and you'll figure out how to get the best fills, and best range in your cars. Happy motoring!

Just a little question here.. I see that you talk about pressures up to 4500psi....What pressure are the CNG tanks in the honda approved for? Here in Sweden all our CNG fillingstations have the maximum pressure of 3000psi...

I think the CNG tanks in our cars in Sweden are test pressurized up to 4300psi as maximum pressure..

In your example above you say that the fillingstation deliver more pressure during the winter? That sounds strange, or is it a typo by your side? In the winter the cng pump should deliver less pressure due to temperature compensating. As the gas expand when it becomes hotter..

This is an example at our swedish forum where we discussed filling pressure:
If i fill my car at 32F and drive into my garage 68F the gas pressure would rise approx 217psi...

[cngmike]

Re: GX Fuel Capacity

DOT rules say that you can fill a tank to 125% of its rated capacity during Fast fill. This is for temperature composition and heat of compression. But you can only operate it at its rated capacity. With this in mind at a temperature compensating dispenser on a 100 deg. day a 3600 psi vehicle should be filled to 4150 with a max of no more than 4500, 3000 vehicle to 3400 with a max of no more than 3750. of corse the flip side is on a -20 deg. day a 3600 psi vehicle should only be filled to 2075.

[taz]

Re: GX Fuel Capacity

DOT rules say that you can fill a tank to 125% of its rated capacity during Fast fill. This is for temperature composition and heat of compression. But you can only operate it at its rated capacity. With this in mind at a temperature compensating dispenser on a 100 deg. day a 3600 psi vehicle should be filled to 4150 with a max of no more than 4500, 3000 vehicle to 3400 with a max of no more than 3750. of corse the flip side is on a -20 deg. day a 3600 psi vehicle should only be filled to 2075.

Ok, I'm with you on that. Overfilling because that the dispenser does not know the temperature of your CNG tubes in your car. Cause those will heat up during a quick fill. The outside temperature the dispenser fix with temp.compensating..

I just checked with our biggest gas company in Sweden. They said that the highest filling pressure is 3335psi at 30c (86F). And at a normal winterday -10c (14F) 2200psi is used. So im jealous of you that you can fill 3600psi or more in your car then.... hehe..

What is your CNG tanks maximum pressure limit?

[moore101]

Re: GX Fuel Capacity

...... So im jealous of you that you can fill 3600psi or more in your car then.... hehe..

What is your CNG tanks maximum pressure limit?

I am jealous that you can drive a Bi-fuel 05 Volvo. In the US we can only get used Fords/Chevy's and new Honda Civics that run on CNG.