If I go slower speed in my car can I save gas. For example go 60 miles versus 75 on the interstate?

Uh, yeah. 75 mph just gobbles up gas, no matter what car you have.

55-60 shows the best milage for cars.

yes, and so will everyone else lol
if u know what i mean haha

Simple answer yes, going 55 will save gas. Running in the higest gear in a manual transmission and keepng your RPM down will save gas. For example when I am doing 55 my tach is running at 2800, when I am doing 60 my tach is 3200. So I am pushing my gas pedal down lower, ths feeding the enging more fuel.

going 60 instead of 75 can use 20 to 30% less gas.

Yes. Works every time.

sure it saves your gas on a constant drive

Definitely will but don’t want to be a hazard to the lead foots. Make sure you stay to the right. There should be little difference in 60 and 65 if you want to go a little faster to not block traffic.

Depends on the car. I drive up i5 to the Sonoma/Napa valleys every 2 months. I played with the mpg to see whats the optimum for my car. It turned out to be an indicated 76mph where I get 30 mpg on a 265 mile stretch from Grapevine to Livermore. Same mpg either direction. One or 2 mph either way and the mpg suffers noticeably. The car is an ’03 Accord Coupe with a 3 liter V6, 6 spd manual and low profile tires.

Yeah, it’ll save loads. Almost like paying $3.00 a gallon for gas, instead of $4. Fillups will still cost the same but they’ll happen 25% less often.

That’s just the tip of the iceberg. Search “hypermiling” for more good ideas, just don’t get too crazy about it like some of them do!

76mph optimum? I’m not believing that. He must have messed up something, like running the A/C on one trip and not another. A car’s sweet spot should be somewhere around 40-55 mph.

There seems a bit of confusion: Yes, 60 will definately be more economical than 75 unless your car has ridiculously long gearing: Your car should hit maximum economy at it’s maximum torque output (check your handbook), NOT necessarily at lower engine speed, as this can cause the engine to ‘labour’ & you’ll need a greater throttle opening to maintain speed. Your car’s economy will decrease with speed due to wind resistance, and be more economical at lower altitudes & lower air temperatures due to increased air density.
If your engine is turbocharged, there will be a point at which the turbo is generating enough pressure for you to maintain speed at lower throttle openings, so that’ll affect your optimum economical speed too.
Wider tyres increase rolling & wind resistance & so reduce economy too.
It’s very complicated!

You will save gas by going slower, but a lot of people will be giving you the bird for going so slow.