Fuel question

This is NOT a complaint page about fuel economy. I repeat: NOT a compliant post about fuel economy lol.

This truck is behaving against my previous knowledge/experience with fuel in almost every way, and I am throwing this out for feedback/consensus. Let me explain: I get shit mileage. lol. I go with traffic on the highway here at about 85mph, I am never the slower guy off the line, I accept that my 14.9mpg on regular gas is probably all I am going to get, as this was the same rough average I saw on my old Ram as well. I was a little disappointed compared to reviews I saw showing better economy than I am getting, but I am willing to take the blame.

I did a test though this past week, that is confusing. I reset my trip meter, and ran half a tank of gas driving like a 90 yr old half blind guy trying to savor my last driving moments.... computer shows NO discernable difference. I got up to 15.1mpg for a stretch, but went back down to 15.0 and stayed there. Curious. So then I put a higher grade fuel in for my next fill up. Tank was almost empty, so I didn't have a mixture of fuel to degrade results. Again, zero difference in fuel mpg. 14.9 again.

I have never had a truck do such a flat showing on fuel. What the hell?
Also I had a Hyundai Veloster Turbo (only personal experience with a modern factory turboed car), and they found about a year after the cars came out and some tuners finally cracked the ecu, that the manufacturer left significant efficiency on the table in the name of not paying for a better tune. That car was more "tuner" friendly, so obviously that kind of thing gets found easier. But this truck really makes me wonder if they really got the most out of the stock turbos and tuning. For either efficiency or power.

 

All these results from the truck computer or hand calculation for MPG? If the computer, they are typically off, so do a hand calculation based on miles traveled and gas put in at fillup. You may be surprised with the results.

Also, based on the many mpg threads, the 2022s MPG tend to bump up after several thousand miles.

And with any tundra, shaped like a brick, MPG will suffer at 80+mph. Sweet spot for Tundra MPG is speeds ranging from 45-60.

I will literally get 1.5 MPG better (tank average) if I keep speed on highway around 70-75 vs 80MPH, so your 85 mph highway drives are not helping.

 

I can assure you hyundai did not put in a better tune because it would have cost more. Usually it's to meet emissions standards or keep cylinder pressure, temps, boost, etc within designer spec. Either way. "Better" tunes don't cost an oem more, there are other reasons.

When you were granny driving, what was your cruising speed? Still 85 but getting their slower?

As for octane change, on ford ecoboost (the most analogous engine that has more data avilable) it usually takes 2 to 3 tanks for the ecu to retune to take advantage of the anti knock properties. I still don't know if toyota even baked in different octane tunes or not.

 

Check your settings, it could be set to calculate ‘total’ ave mpg, not ‘per tank’. I ran into this same issue when gas prices skyrocketed this earlier this year and I changed my driving habits.

 

I did my first 2 hour highway trip this weekend and decided to test the difference in mileage going to and from. On my way to the desired location (Salmon River, NY to steelhead fish), I set cruise within the 79-83 mph range. In doing so, I averaged 15.9mpg. On my return trip home yesterday I set the cruise at 65-67 mph and averaged 21 mpg. Yes, this was computer generated data, but both trips started off with a full tank and outdoor conditions were identical. Pretty dramatic difference.