R U Guys adding gas to my truck?

1900 miles now.

200 miles 16.9 mpg
800 miles 18.0 mpg
1100 miles 19 mpg
1400 miles 19.5 mpg
1700 miles 20.0 mpg
1900 miles 20.4 mpg

same driving on same type roads same gas..

I added a 100 lb Toyota bed cover and the mileage jumped .7 mpg

At this rate at 5k miles I should be getting about 30 mpg !!!

 

The truck is breaking in, you'll hit the ceiling around 6k-7k.

The bed cover gives your more aerodynamics since the wind force isn't distributed to the inside of the bed.

 

So what is the mpg at ceiling?

 

It varies. I got a maximum of 23mpg but apparently I'm a unicorn here. Depending on your driving habits and your tire size, you should get roughly 18-21 mpg.

 

Probably due to break in and the fact that average temps are getting higher since Winter. These trucks do not love the cold.

 

My truck got much better mileage after 10k. Last tank was 300+ miles of freeway driving and got 21.6

 

More to do with the gas mix that most stations use in the winter. Cold air is better for motors.

 

My Tacoma averaged 13.5 hand calculated.... Driving like grams and doing the speed limit.

A tounnea cover did nothing and I stayed at 13.5mpg from day one through 20k

 

Well there's your problem, your dragging around weight. You need momentum. Better to gas it and coast.

 

Yea perhaps lol. I was always too scared to try ECT because I was already getting 13.5, I didn't want to stomach even less

 

I've never even activated ECT in my truck yet, even when I get 23mpgs

 

yep. big part is winter mix gas to summer gas. always makes about 2mpg difference every winter on my vehicles.

 

I concur, definitely lose 2 in the summer

 

My MPG is a few higher on days it's been 60 degrees than days it's been 15 degrees; both with a full tank of Winter blend.

 

Yeah I'm probably an 80/20 city/highway driver and I avg 19.0. All depends on how much time you spend on the highway and whether you keep it around 65mph or are cruising at 75+. I get my best mpg on flat ground doing about 50mph.

 

Wouldn’t the ECU have to increase the amount of fuel due to increased air density?

 

Uhm no? Lol AFR stays the same so less fuel for dense air

 

Not accurate.

The bed of a truck creates a 'separated bubble' of air within the bed, created by slow moving air revolving in the bed space, like a churning eddy. The faster moving air then rides over the top of this bubble and over the edge of the tailgate, thus decreasing drag.

The bed cover actually increases drag (however slight this change may be) because there is no longer a bubble for the faster moving air to glide over. Instead it comes off of your roof and drops down onto the bed cover, increasing the pressure between the tire and the road.

 

Your own statement contradicts itself.

JCT86 is correct.

AFR literally means Air to Fuel RATIO, with ratio being the critical word.

An increase in air density results in an increase in fuel usage in order to maintain the AFR.

Phew, this thread is a doozy thus far, and we are only on page 1!

 

At 10k when my truck was completely stock, I maxed out at 19.5MPG, could never break 20MPG. Now that I’m slightly lifted running 32” tires I average 17.5MPG. You’re probably reaching peak performance MPG wise.