Noticed my new 5th gen only gets ~14-15 mpg on routine driving country roads 40-50mph. Still 20mpg highway, but 14-15 is what I'd get on the same trips in my 4th gen V8 "gas guzzler!"

I'm getting 17.1 mpg around town and 18 mpg on the hwy in a Limited using 91 octane winter gas. I get better slightly mileage with summer gas. Best i've seen is 20mpg in the summer on the hwy.

Both engines have the same horsepower.

There's already an entire thread dedicated to gas mileage. Search, and join the conversation there.

dudes. there is a huge thread on MPG already.

Still gathering data on my July 19 4R.

I can get ~20mpg+ on highway with traffic keeping me around 60mph avrage.
I get about 18 on highway with sticking to 72mph.
80mph i can barley get 18mpg.


Country roads i get around 15mpg to 19mpg, but it greatly depends on speed/hills/throttle. So far it seems like 50-60mph is a sweet spot for best MPG.

I would use regular gas and stop with the 91, its a waist since you will get the same MPG and power with regular. You may even get better MPG with regular since the truck is set up for regular gas.

Keep in mind there are some additives in the winter for gas that will cause worse MPG (Ethanol).

You bought the wrong vehicle. It's a naturally aspirated 4.0 v6. Turbo six is what your looking for.

Also what are you doing that's getting 14-15. I only get that when I air down off road in 4x4. Maybe look at the way you drive on those country roads.

Give this a read.
How to Hypermile (with Pictures) - wikiHow

and ya tons of threads about this already

Will 285s rub?

Hypermiling lol, I thought that was just normal driving...

Over the 35,000 miles I've owned my 2019 (stock everything), I've averaged 21.8 mpg or a little better. Combination of freeway, country roads, and city. My calculations match the displayed mpg.

Only skimmed the 'Hypermiling' link, and one thing it says is to accelerate briskly. While I will do this in traffic (don't want to be THAT guy), I drive with a pretty light foot otherwise. My acceleration is on the slow side, I do try to maintain steady speeds, and I take advantage of downhills to coast (AND to accelerate if an uphill is immediately after). I look down the road and will let off the gas if I expect I'll have to stop in the next 1/4 mile - again, as long as nobody is behind me. No late-braking if I can help it. I try to let physics help with much of the acceleration and deceleration.

Driving style, gas blends, or environment must be way different for many others who say they're getting 15-18 average on a stock Runner. I don't think I could make my average dip to 18 in my world no matter how aggressively I drove.

I find driving with a pretty light foot, acceleration on the slow side and letting it coast when possible 19+ is easy. But i bet if you held higher speeds (80+) and drove more aggressively fast start/stop i bet you would be lucky to break 18mpg.

You did NOT read it properly.

Be gentle with the accelerator. The 'accelerator' is so named because it pushes more fuel into the engine, making it run faster — and also lowering your fuel economy and increasing your output of pollutants. Go gentle on the accelerator and you'll see savings in your gas bill.

*Push the pedal down slowly, and lift it up as soon as you know you're going to need to stop (when you see a red light, a stop sign, or brake lights from the car ahead of you) so that you can coast the rest of the way.

*When hypermiling, you should never need to push down the pedal by more than an inch (2.5cm).[2] Some recent cars may in fact have pedals that "push back" when you're accelerating too aggressively.


If you do have to accelerate, get it over with quickly. Fuel efficient vehicles actually generate better gas mileage when a "brisk" acceleration method is used. Slow acceleration will yield less mileage on such highly efficient cars. But any acceleration makes for terrible mileage, so get the acceleration out of the way so that you can cruise (excellent mileage!)

Notice is says "fuel efficient vehicles". So not us.

let's all agree to not post anything from wikihow any more.

I typically drive 75-ish on the freeway. Don’t see a need to go 80 or more. The rest of my driving, of course, is slower. Still don’t think 80mph would drop my mileage almost 4 mpg from 75mph.

That doesn't mean anything. Also, the 4.7 makes more torque, and at a more useable RPM. The 4.0 is to peaky.

Also, the 5.7 LS1 in my Firebird has more HP, WAY more torque, and gets better MPG than my 4.0. Apples to oranges, but still.

To the OP, that mileage doesn't sound out of line. It'll probably improve as it breaks in. Also, I didn't notice where you're located, if you get the crappy winter blend gas, that'll make a difference too.

I do mostly highway, 400-ish a week, at 70mph or under, and get a hair over 21. Last tank was 21.2, hand calculated.

I notice these motors are pretty weak in the 40-50mph range, esp once they shift into 5th gear. You may just be working it a bit harder than you think if you spend a lot of time in that range. I know I get frustrated with mine at that speed if it's anything but flat.