What is the best speed on interstate to save gas?

check with Nissan

I have heard that anything over 60mph hour burns more fuel.

A lower, constant speed will usually give you better mileage, but you also don’t want to drive so slow that you lug the engine (drive below an engine speed that the car was designed for). Make sure your tires are kept at proper inflation, and that you change your oil every 5000 miles. That will help alot. Then try driving one day at 55, next at 65, etc and see what works best. I’ll guess about 55 will work best.

You should go as slow as you can in top gear without under revving the motor. usually this is somewhere between 45 and 55

Yes, as others have mentioned, above around 50mph, not only is your engine revving higher (thus decreasing fuel efficiency), drag/wind resistance is increasing exponentially, which again means the engine needs to work harder to maintain the speed. But seriously now, I wouldn’t suggest driving that slow just to save some dollars, because the fuel saving is gonna be negligible and at the end of the day there’s more to life than saving money.

But here’s some more fuel saving tips anyway
- Fuel is most used during acceleration, so slower acceleration = less fuel. While cruising on a freeway, limit overtaking and try to maintain a CONSTANT speed, because a varying speed means you are constantly decelerating/accelerating
- As others have mentioned, tyre pressure is a really big thing; generally about 32psi is about right?
- It’s probably a small thing, but mirrors create quite a bit of drag, so if you’re really pedantic maybe consider pulling them in and doing a few more head checks.
- If possible, try to slot in behind some who is driving at a constant speed (preferably a truck) as this will give you a nice drag-reduced zone – wind resistance will be drastically reduced, thus improving fuel economy. It can be dangerous though, and many drivers won’t appreciate it, so proceed with caution, and don’t sue me (actually you can’t, cos I’m in Australia and you don’t know my name… muahah!)
- In city driving, coast to a stop as much as possible (ie don’t speed up to a red light and stop really quickly); as soon as you see the light go orange, slow down gradually and come a nice easy stop.

Hope that helps, and remember, there’s sometimes more to life than saving fuel, and if travelling at 70mph instead of 50mph is costing you $2 more in fuel a day but saving you 10 or 15 minutes of dreary travelling, I’d say it’s worth it….

55

You should save on gas .on the interstate when traveling 70mph. the slower you go the more gas you use.i no this by driving in the city.y ou have to go slower.and you use more gas but you get on the interstate and go 70 you don’t use much gas.in the city you have to stop a lot and start back up that uses a lots of gas.

Well if you think about it, the faster you drive the less time you spend on the road. The less time you spend on the road, the less time you run your engine for. The less time your engine runs for, the less time you have to burn gas. So floor it.

Exactly one mile above posted speed limit. It works. Just play it safe and slow down if you even think you cannot live with it.