My girlfriend and I drove down to Baton Rouge this past weekend for the LSU/Alabama game. I decided I was going to see how well my truck was doing as far as MPG. After damn near totally running out of gas in the middle of nowhere Mississippi (it's amazing how few gas stations there are on the interstates in this state) I realized that I only got 270 miles on that tank. Assuming a tank size of 16.2 gallons, that equates to a whopping 16.7 mpg on the highway. What in the world? I just did a little research online and the '01 2WD should get 20 mpg on the highway. A couple of things I have working against me are my roof rack (wind resistance) and the 265/75/16 Revos, but are they enough to cost me over 3 mpg? I just don't get it. The engine should be clean as a whistle after several Sea Foam treatments, plus I have done the deckplate mod with an Amsoil filter and done the ISR mod. Where did my mileage go and is there anything to do to improve it? BTW, I've got new plugs. They were changed just a few thousand miles ago. Thanks guys. Later.

Matt

 

One more tidbit that I forgot to add is that I have always run 93 octane super unleaded in my truck. In the three years I've owned it, it hasn't once had anything less than 93 in it. And on top of that, good 93 like Amoco, Shell, Chevron, etc.

Matt

 

well there is a guy on here saying if you floor it you get better gas mileage,

so maybe you werent floorin it, that is why you ran out of gas?

you drive a truck man so its no surprise.

i use to have a landcruiser '92 and on long trips it had horrible mpg. and plus you carry stuff or loaded.

 

matt,

i usually get the same mileage as you, but slightly higher on the highways. i have the same size tires but no big roof rack like you

bob

 

Same here 14 in town and about 16-18 easy highway driving.

 

how fast were you going, I find my milage drop at high speeds. what is your tire pressure?
(your tank should have 18.5 gallon capacity, but how much did you put in it?)

 

What tires did you truck had originally?
or another words what's your diff ratio?

 

 

#1. Go by what you the receipt said, not what you think went in.
#2. Fill up with 87. Assuming that your objective is to save money.

I get 22-23mpg with no over-inflated 32" tires, no seafoam, 87 gasoline and no other silly mods.

 

Not feeling so bad now about my '04 V8 getting 13 city and 17 freeway!

 

air intake, they help a little bit. New exhaust and headers will help a little bit.

 

I have a 1996 SR5 and I am getting about 230/tank. i think its b/c of the amt of miles about 190k and the fact that the surco w/4 hellas create a lot of drag

Matt

 

I've got a Dynomax Super Turbo exhaust on the truck. The stock tire size was 265/70/16. I just find it hard to believe that the small increase in tire size had that much effect on the mileage. I think it's mainly due to the drag created by the roof rack. Maybe next time I make the trip I'll take it off and see if I get any better mileage. BTW, average trip speed was around 80 mph.

 

Could the added weight of the brush guard have anything to do with it? I mean the thing weighs a few pounds, but not a whole lot.

Matt

 

i know all you folks dont get enough math every day, so here you go.

if you went up in tire size, you got more miles per gallon than your 'trip computer' thinks. remember circumferance = 2 pi r. so a 30" tire rolls about 188" in one revolution, and a 32" tire rolls 201". that's 6% further. that would account for a little more than 1 mpg in 20.

sorry if you already get enough math every day.

 

I used to get 23 on freeway, but right after I replaced with 275/70/16 Revo, the best I got is 19 mpg, I average 17 mpg now.

 

I have a 2wd just like you, I used to drive 80 on the interstate, which is natural to me(age 19), but lately I've made myself go 70 or 75 and the milage increase is pretty good, maybe 2-3mpg better.

 

80 mph is too fast to optimize your gas mileage. obviously, the slower the better but after 65 mph, the MPG does down really fast, especially with your roof rack.

 

I keep a consistent 20-21mpg with just keeping my tach under 2k rpm in all conditions.


i dotn have a brush guard or aftermarket roofrack though.

 

If you had the windows down that would also decrease mpg. I think all the things you mentioned add up to 3mpg less. The roof rack alone I think is around 1 mpg. A fairing on the roof rack would help. I'm getting about 19 mpg with 285/75's.