again, some people claim that driving 85-90 mph gets them better mpg than 65. is there anyway that this is possible?

 

I've found that when I set the cruise at around 70-75 mph on the highway, I get at least 26 mpg. But any more than that and it'll drop considerably.

 

lets just say i almost went through a whole tank doing 95-100, and i almost fell over when i filled it up, 29mpg, No joke

 

I went through a whole tank going between 85-100 and I got 22mpg. Drive back the same route in heavy rain and bald tires going pretty slow, 50-70 and I got 30mpg

 

Any change in altitude between start and finish? Headwind versus tailwind?

 

[QUOTE=dyhppy,Jan 21 2007, 05:24 AM] again, some people claim that driving 85-90 mph gets them better mpg than 65.

 

Lots of people don't think about this, but whether you're traveling with the wind or against the wind makes a significant difference in gas mileage also. It's more evident in larger vehicles, like SUV's, but even in a small car like the S2000, traveling into a strong headwind will reduce gas mileage 1-2 mpg. I notice that in my wife's MDX, it's a good 3 mpg at the same speed. We just did a 600 mile round trip in the MDX and I averaged 25mpg going down, but 22mpg going back. On the way back, winds were howling out of the north and I could feel and hear it fighting us.

With the S2000's gearing, I think the engine becomes most efficient around 4,000-4,500 RPM for cruising.

 

I think it's agreed that the car runs more efficiently (fuel wise) at 65MPH - 75 MPH than 55 MPH.

I think.....

 

what gives?

 

I've always heard that, in general, 45-55 is the optimal speed for fuel economy. But, maybe that information is a little dated. It probably depends a lot on the aerodynamics of the car.