Why does my mileage suck?
- Thread starter red87
- Start date
Cody1771
Explorer
33,s weigh a lot more and I bet it woul make a big difference
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I am here: http://maps.google.com/maps?ll=48.587661,-123.417228
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I am here: http://maps.google.com/maps?ll=48.587661,-123.417228
TRegasaurus
Adventurer
Sure, tires are a factor. I lost 2mpg's upsizing my tires. Also your Montero is a '96, that motor is making a lot less power than it used to, and it'll take more fuel to make up the difference.
scrubber3
Not really here
You may want to consider the fact that you tires have a larger circumference therefore it may seem as though you have not gone as far as you actually have but using the same amount of fuel. Larger tires throw off the speedometer AS WELL as the odometer. You have to factor in the difference.
off-roader
Expedition Leader
divide the orig stock tire size by 33 to determine the percentage greater your mileage is over the indicated mileage on your odometer. same percentage should also be added to your vehicle speed.
scrubber3
Not really here
off-roader, wouldn't you want to find the difference first? I mean, shouldn't you subtract the actual tire size from the factory size. Then.... oh nevermind. use this http://www.miata.net/garage/tirecalc.html By its calculations, the new tire is around 11 percent different in speed and distance. I'd say that pretty much reflects the drop in fuel mileage give or take.
scrubber3
Not really here
Oh yeah, typically an engine makes the most power just before it's dead. I mean so long as everything is in proper running order. Consider the break in period of most vehicles and the fact that it take a few thousand miles to get the most efficiency out of it. Also, Drag racing cars are at there fastest just before the engine goes "boom" from being too "loose".
Usually though. High mileage vehicles aren't kept up properly therefore lowering efficiency.
Usually though. High mileage vehicles aren't kept up properly therefore lowering efficiency.
off-roader
Expedition Leader
Yeah I had it backwards actually. Divide the new tire size by the original tire size and you'll have 1.xxxxx. The xxxxx times 100= the percentage greater than the original tire.:ylsmoke:
geocrasher
Observer
Figure in the factors above, but also at speeds about 50mph or so the wind resistance is much higher than before, and that makes a difference too.
speedtre
Explorer
Try some Seafoam
I was getting 14-15 MPG running mostly city driving in my 99 Montero. I ran a can of Seafoam through my intake and my MPG immediately went up to 16-17 MPG in the city. I have no idea what highway MPG is cause I rarely take it on the highway (I live in downtown ATL). Be prepared when you run the Seafoam through...you WILL smoke out the neighborhood.
I have NO affiliation with Seafoam, I"m just a satisfied customer.
http://www.seafoamsales.com/how-to-use-sea-foam-motor-treatment.html#nogo
I was getting 14-15 MPG running mostly city driving in my 99 Montero. I ran a can of Seafoam through my intake and my MPG immediately went up to 16-17 MPG in the city. I have no idea what highway MPG is cause I rarely take it on the highway (I live in downtown ATL). Be prepared when you run the Seafoam through...you WILL smoke out the neighborhood.
I have NO affiliation with Seafoam, I"m just a satisfied customer.
http://www.seafoamsales.com/how-to-use-sea-foam-motor-treatment.html#nogo
scrubber3
Not really here
To be honest, you can run transmission fluid through the intake as well. (vacuum line) But it smokes out so bad, it WILL blind other drivers if they are behind you. :Wow1: It's an old mechanic's prank to slip a little black can under one of you co-workers intakes and hook a vacuum line into it. Not only is it hilarious, but it does actually clean the intake. I would trust seafoam a little better for most applications though.
speedtre
Explorer
When I did the Seafoam, I literally did blind some drivers behind me. I didn't realize it was going to smoke THAT bad (despite reading the warnings on the lable). Looking back it's funny, but at the time it was dangerous considering how busy that street is and I felt very bad about it. I will be MUCH more careful the next time I do it to be sure not to blind anyone.