MPG’s - Fact Or Fiction??

Oh boy, another MPG post.
Coulda tagged onto one of the many threads on this topic.

I don't care about the trip MPGs - it just doesn't matter. Hell, I could hit 30 MPG easy - on a 300 mile constant downgrade at 65 MPH.
What matters is my calculated tank MPG - cuz that's what I'm paying for.

 

Noted.

 

On stock tires my best was 25MPGs driving slowly on some snowy roads.

Then I had to put on 33's and now it's about 17/18MPGs average.

Someday, as I want the torque back and slower low range, I'll regear and that should largely correct my loss in MPGs.

 

Used to get 23-24 mpgs when was on stock Firestones tires. A few time I got 450 miles on the tank.
Not a fiction...

 

Range is always nice. I’m confident I can stay over 20 with my new slightly heavier tires.

 

I stay over 22mpg on every tank i've had so far on 265s and I drive 50/50 city/highway

 

Found my "record". Actually squeezed 465 and 24.5 mpg

 

Here’s what I got from work to home .

 

With “mellow” driving I do fairly well on the way to work considering the 285/70/17 duratracs, full skids, sliders, and rsi cap. My commute is 70/30 hwy city.

 

I end up getting 18.5 with 900lb swift shell. Key is driving 65mph or less!! Premium gas seems to give me +1mpg

 

Yeah I have kept my truck very light, no armor at all at the moment.

 

My truck basically gets me to work, occasional dump run and plowing. Be nice to average over 20 MPG and only need to gas up twice a month.

The 24.1 motivates me to pay a little more attention to the throttle. 20-22 should be attainable.

The only extra weight on my truck is a front mount hitch receiver for my plow.

 

Um, no. I am sorry to tell you that is not how physics works. You still have the losses of accelerating a heavy tire from rest and rolling resistance loss from a wider and rougher footprint. Your gearing does not make up for that loss, it just means the loss will happen at a different RPM. You will still have to put out the same amount of horsepower you are putting out now, which is why you burn more fuel.
If what you said were true, then we could just adjust gear ratios until we got 100 mpg.

 

Makes complete sense….damn physics…gets me every time!

 

2017 OR DCSB AT stock gearing, Yoko Geolander, stock size. Get 24-25 everyday.

2018 Sport MT AC. Stock gearing, Nitto shit grapplers, 33. The entire Eco armor catalogue. Get about 17 on the commute.

Both are tuned with KDMax 10.0, both get regular services with BG products courtesy of me

 

MOST vehicles' MPG calculations are a little optimistic. Some by 2-5 mpg, some by 1/2 mpg. Do the calculations by hand and then you'll know. My older Tacoma doesn't have that feature. My 10-year-old F150 has never been wrong by more than 1 mpg and is almost always either 100% accurate or within 1/2 mpg. But my wife's Explorer is usually about 1-2 mpg off. The Honda I sold to my son was off by as much as 5 mpg at times. And every time hand calculations show lower mpg's.

 

Now I don’t feel like such a tool driving around with a rail mount Rotopax…..

 

I can pretty easily get 20-21 on the highway (GOING THE SPEED LIMIT) with my wildpeak 265/75's. Have never taken the time to actually calculate it at the pump though, but I know I'm getting better than the estimated 20-21 due to the 3.3% difference in tire diameter from stock.

 

You do realize that with 33" tires your vehicles odometer and speedometer are now reading low. That means that you're driving a little farther on each tank than your odometer shows. This messes with the onboard calculations. If you account for that difference and figure it manually, you're actually doing a little better than 17/18 mpg. You are probably closer to 18/19 mpg, maybe more.

And since your speedometer is showing you driving slower than you really are that affects your driving. If you think you're doing 70, you're really doing about 73-74. If you'll slow down about 5 mph you'll add another 1-2 mpg to that. IME 70 mph is like hitting a wall. Keep it 65-70 and fuel mileage is pretty darn good. At 70+ you start sucking gas with a truck. You should be able to get 20+ on the road with those tires.

I wouldn't regear for such a small difference in tire diameter. If you were going to 35's yes.

In the 17 years/245,000 miles I've owned my Tacoma I've had tires that weighed 38 lbs, tires that weighed 53 lbs with most around 45 lbs. each. They were all 31-32" in height and all were 265mm wide with a mild All Terrain tread. My fuel mileage has never varied. The heavier tires did hurt acceleration. You can feel the difference when you need to accelerate quickly. But once up to speed heavy tires don't need any more power to keep moving than a lighter tire.

When you go to 285mm or wider tires and tires with aggressive tread it does effect rolling resistance. You won't coast as far and will need to spend more time on the skinny pedal. That will cost you fuel mileage and acceleration at all times.

 

LMAO @ these threads.
I have to wonder what you guys are actually thinking when you decide the time has come to sit down at your computer and post your almost always inaccurate mpg's to a bunch of strangers on TW.
If your family doesn't care, and they don't or you wouldn't be posting it here, what makes you think anyone else would?