Johny Utah Posted April 5, 2016 Report Share Posted April 5, 2016 I just bought a 03 Tundra 4x4 V8 limited. It has newer BF Goodrich all terrains on it. I have installed a Volant cold air intake an air raid throttle body spacer, Denso iridium plugs, Mobil 1 high mileage synthetic oil, And also changed the front and rear differential oil and transfer case oil to Royal purple gear oil. The gas mileage has not gone up. Am I stuck with this gas mileage? It's getting around 14 mpg with city and highway mixed. Quote Link to comment Share on other sites More sharing options...
zeitgeist57 Posted April 5, 2016 Report Share Posted April 5, 2016 4x4, V8, knobby tires... I'm not an engineer for Toyota, but I'm guessing you're looking at that as normal mileage unless you get really gentle with the gas pedal, and lower your highway cruising speed to 60-65mph. Quote Link to comment Share on other sites More sharing options...
turbospec29 Posted April 5, 2016 Report Share Posted April 5, 2016 The tires are killing you but you'll never see better than 17-18 anyway. You could try adding 5psi to each tire and see if that helps a little. Quote Link to comment Share on other sites More sharing options...
2 Sweet Posted April 5, 2016 Report Share Posted April 5, 2016 100% normal for those trucks. Quote Link to comment Share on other sites More sharing options...
jeffro Posted April 5, 2016 Report Share Posted April 5, 2016 Just curious, what were you expecting to get out of it? Quote Link to comment Share on other sites More sharing options...
Johny Utah Posted April 5, 2016 Author Report Share Posted April 5, 2016 I thought the tires are not helping. There is 35 psi in the tires now. It would be hard to keep it around 60 on the freeway. I thought I could get around 17 to 18 mpg with what I did to the truck. Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted April 5, 2016 Report Share Posted April 5, 2016 100% normal on any truck. Quote Link to comment Share on other sites More sharing options...
BStowers023 Posted April 5, 2016 Report Share Posted April 5, 2016 Yeah, expect any older 10+ year old full-size V8 truck to get under 20 mpg almost guaranteed. I've been looking at work trucks (Tundras being one of them) and they are all fairly similar with the exception of older Rams (horrendous mileage) Quote Link to comment Share on other sites More sharing options...
Johny Utah Posted April 5, 2016 Author Report Share Posted April 5, 2016 I'm just surprised with what I did to the truck gas mileage did not go up any. Quote Link to comment Share on other sites More sharing options...
turbospec29 Posted April 5, 2016 Report Share Posted April 5, 2016 I thought the tires are not helping. There is 35 psi in the tires now. It would be hard to keep it around 60 on the freeway. I thought I could get around 17 to 18 mpg with what I did to the truck. Are they LT tires by chance? give 40psi a try. Quote Link to comment Share on other sites More sharing options...
Johny Utah Posted April 5, 2016 Author Report Share Posted April 5, 2016 I'm not sure. There are different all terrain styles? Quote Link to comment Share on other sites More sharing options...
Cordell Posted April 5, 2016 Report Share Posted April 5, 2016 Make sure everything is in good order, ie nothing is dragging. Try getting it around 35 or so and popping it in neutral, see how well it rolls. Not sure you'll find anything. You'll likely have to deal with lame gas mileage on an older 4x4. Quote Link to comment Share on other sites More sharing options...
Gergwheel1647545492 Posted April 5, 2016 Report Share Posted April 5, 2016 http://www.fuelly.com/car/toyota/tundra/2003 looks to be about normal for those trucks. Quote Link to comment Share on other sites More sharing options...
iwashmycar Posted April 5, 2016 Report Share Posted April 5, 2016 I agree 14 is pretty decent. Now one thing that kills mileage on the v6s ( I know you said v8) is an old/sticking thermostat. If you have a lot of miles it might be worth looking into. They get weak and dont build proper pressure thus the engine wont heat up to optimum temp and then the computer compensates by dumping fuel. Also clean the MAF....especially if that new filter is oiled. Quote Link to comment Share on other sites More sharing options...
SPL_Josh Posted April 5, 2016 Report Share Posted April 5, 2016 Sounds about average. Tundra, Titans, and Hemi Rams always get bad mileage. Quote Link to comment Share on other sites More sharing options...
Geeesammy Posted April 5, 2016 Report Share Posted April 5, 2016 My truck gets 10-12, don't feel bad. Quote Link to comment Share on other sites More sharing options...
Rocky31186 Posted April 5, 2016 Report Share Posted April 5, 2016 My 2011 crewmax tundra gets 15 city 17 highway. Quote Link to comment Share on other sites More sharing options...
aussiek2000 Posted April 5, 2016 Report Share Posted April 5, 2016 My 16 Tacoma only get 14-15 highway. The 90+lb wheel/tire combo kills the fuel economy Quote Link to comment Share on other sites More sharing options...
cdk 4219 Posted April 6, 2016 Report Share Posted April 6, 2016 I just bought a 03 Tundra 4x4 V8 limited. It has newer BF Goodrich all terrains on it. I have installed a Volant cold air intake an air raid throttle body spacer, Denso iridium plugs, Mobil 1 high mileage synthetic oil, And also changed the front and rear differential oil and transfer case oil to Royal purple gear oil. The gas mileage has not gone up. Am I stuck with this gas mileage? It's getting around 14 mpg with city and highway mixed. Did you really think any of that stuff was going to make a noticeable difference? Try some O2 sensors and a new mass air, money better spent. Quote Link to comment Share on other sites More sharing options...
Johny Utah Posted April 6, 2016 Author Report Share Posted April 6, 2016 I really thought it would give me a few more mpg's Quote Link to comment Share on other sites More sharing options...
iwashmycar Posted April 6, 2016 Report Share Posted April 6, 2016 You could try and offset some of the wheel weight by getting lighter wheels. SCS makes pretty darned light Toyota specific offerings, but that money spent wont be worth it to offset any fuel costs...just might get you some more miles per tank and make the truck look better. OEM Toyota wheels are all around 30# each...and the SCS ones can be in the teens I think. Quote Link to comment Share on other sites More sharing options...
Johny Utah Posted April 7, 2016 Author Report Share Posted April 7, 2016 I would like to get new rims. I don't think I'm going to put much more money into the truck though. I filled up yesterday and got 14.5 mpg this time. Quote Link to comment Share on other sites More sharing options...
gillbot Posted April 7, 2016 Report Share Posted April 7, 2016 Guess my Ram isn't as bad as I thought http://i72.photobucket.com/albums/i191/gillbot/image2_zpsamefeawv.jpg Quote Link to comment Share on other sites More sharing options...
Second Gen Posted April 7, 2016 Report Share Posted April 7, 2016 I have a 2006 Double cab (Non-4x4) and 16 is the average in the city. The 4x4 versions were about 1 mpg less so you are close. Freeway you cannot get over 21 mpg (20 for you with the 4x4) Have same ghetto Volant (Noisy as hell) CAI and it might help a bit. End result/cause is the motor/drivetrain. * Assuming the big tires (Even @ 100PSI) is another factor. Solid truck even supporting Opec : ) Quote Link to comment Share on other sites More sharing options...
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