The flattest state in America?
 

I really hate hills sometimes! I probably climb over 3,000 feet a day in elevation gain and loss. Hypermiling tip: consider moving to the gulf, Illinois, or Delaware. Kansas?

What is the US state that is the most flat?

I've heard you can get better fe in hilly country than flat.

My Subaru cruses 60mph on the flat at 27-30 mpg. up a hill it gets 15-22 mpg. Down the same hill engine on coast it gets over 150mpg. (15+150)/2=82.4 mpg. If there are no reasons to stop at the bottom I love hills.

2 / (1 / 15) + (1 / 150) =27.27mpg < 27-30mpg. You always have to climb up the same hill you went down, and Ideally, your average can only be double the mpg you had while going up the hill.

If your going to drive with load, your going to be varying your speed considerably. And if your going to coast down hill, well, your now your just doing P&G. And P&G on a level road will always get you better mpg than a steady cruise, with the exception of leanburn.

Level roads are also idiot proof. You just have to stay at your target mpg/speed, and your golden. You have tens of thousands of people everyday saving fractions of a gallon on the flat route and it adds up.

I love hills. It was a real thrill coasting down the mountains coming back from Blacksburg. I actually had to use engine braking when I got close to 80 MPH behing a big rig. I get better mileage in hill country. Basically west of my house is hills while east is farily flat, but I use every elevation change by pulsing uphill and coasting downhill. I will allow slight drops in speed going uphill and recover downhill. In many cases I can extend my coasting by over 100 % even where the hills will not allow coasting at sustained speeds above 45 MPH.

regards
Mech

I've driven in hills extensively living in WV. The really steep mountains are an issue, but the rolling hills I almost always get better mileage as I can essentially "Pulse and Glide" using gravity instead of my speed. Some of the better coasts through western Maryland (Cumberland Area) and PA can last several miles.

When the hill gets too steep however, I have to eventually drop to 3rd to climb it (or at the very least, the torque converter will unlock) which drops efficiency. Then going back down it I simply go too fast to stay anything close to the speed limit, and that makes me not coast as long as a result of having to brake or using engine braking to slow my speed.

Not necessarily. Depending on the grade, you could be driving closer to best BSFC on the uphills.

If we want to consider not the whole state, but sizeable areas within a state, then I'll vote for Nevada's Black Rock Desert as flattest. It's so flat that when water collects on parts of the playa in a wet spring, a good wind can move the resulting "lake" miles from one side to the other.

Flat land is all about handling winds. Favorable winds mean unreal mpg.

Apparently none of you have been to North Dakota. It's FLAT. If there are more than three hills within a square mile, they make it a state park.

OMG. I LOVE coasting down those mountain sides on I-70 and I-60. With a CAI, my all time high MPG on my Mustang is a 24.0 from Fairmont, WV to a gas station somewhere on I-70. 100% hw miles. With the ultraguage, I coasted about a mile at a 6% grade around 80 MPH+ (my dash beeps at me when I exceed 75) and the UG read 200-250 MPG in neutral.


I hope to be able to do that drive again now that I've dumped the CAI. I should be able to get 27-28 MPG on that route now as I got 23-24 MPG this winter