how can i save gas on the freeway?

slow down, huge difference between 70 and 55.

Take it easy on the gas, drive a little slower, try to use your cruise control…

And all the other stuff about maintenance and keeping your tires properly inflated.

Keep the windows wound up use the AC as little as possible and accelerate smoothly. And don’t carry unnecessary stuff in your car like golf clubs & remove roof racks when not in use.

control on speed. avoid unnessery break.

Well, there are quite a few ways. It would help the tremendous amount if you could reveal what kind of vehicle you drive.

If anyone is skeptical about snake oil solutions, it’s me. I will not buy anything like that. However, I was in a pick your own part junkyard one day and came across one of those fuel homogenizers. So I figured why not? Let me tell you it would have spun a toupee on my head if I had one! On a 92 Suzuki Swift: six MPG City, nine MPG highway gained from that stupid magnet. What can I tell you? I don’t want to believe in them either, but they work. And I’m not exaggerating either.
It’s probably a pretty slim shot finding another one in a junkyard, so you’ll have to research it. Depending on your vehicle it is possible to increase the overall diameter of your tires, thus gaining a higher final ratio. Again, depending on your vehicle you can get an overdrive installed in some automatic transmissions which is incorporated in the tail shaft of the automatic transmission.
If you have a carburetor there are plenty of procedures that can be done in order that you use fuel sparingly. Depended on vehicle again, modifications in ignition timing can make potentially great gains. Offsetting camshaft timing can have a positive effect too.

Some of these modifications could cause the vehicle to fail smog due to improper settings and not excessive hydrocarbons although there would be an increase in nitrogen oxides.
If your car is a candidate for the secondary modifications I mentioned I will add the detail later.

I drive a rented Chevy Cobalt from LA to Vegas in June. It had an on bar mileage computer and display. Rated at 36 MPG highway. I stuck to the speed limit and until juat past Baker, I got 44.6 MPG. However, because of a hugh climb there, by the time I got to Vegas I averaged 41.6 MPG.

On the way back I paid no attention to my speed and drove down through Death Valley and got only 35.6 MPG.

My point is to slow down. Every 10 MPH over 55 and you lose about 4 miles per gallon.

Do not speed drive no faster than 60 mph. Keep your tires aired up correctly. Change oil every 3k miles. Do not use A/C unless you have to . Stay on cruise control as much as safely possible.

pull over at a rest stop<

1. Use your cruise control.

2. Never go pass 2000 RPM”s.

Here are some thoughts from someone who gave up his car two months ago (and just agreed to buy another one – so much for my car-free lifestyle!):

- Keep your speed down. You’ll save a huge amount on gas if you can stay at least 10 miles below the speed limit.
- Turn your engine off when you are at a stop light, or any other time you’ll be stopped more than 10 seconds.
- Turn your engine off and put the motor in neutral if you’ve got a long hill to coast down (over a mile on a highway).
- Don’t let the engine warm up before you start driving.
- Think ahead. The further ahead you can plan, the less braking you’ll need to do. Braking is converting kinetic energy into heat energy (through friction), so you are just wasting that energy.
- Car pool. You’ll save a lot on gas if you are traveling with others who are sharing the cost.
- Take public transit if you can, at least one day a week. In my commute, I discovered that taking the bus means an extra 10-15 minutes for my trip, but hey, I get to read the whole time, instead of cursing at the other freeway drivers.
- Buy the most fuel-efficient car you can find for the type of driving you do most. The EPA lists fuel efficiency of all new and older cars on their website, I think it’s fueleconomy.gov.

There’s a whole community on the web of people who call themselves hypermilers, and who pride themselves on getting far more than the rated miles per gallon on whatever vehicle they drive. I’m sure you can find them with a quick web search.