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Posted By: abcde06991 Mileage modifications - February 17th 2018 8:27 pm
What are some modifications i can make to a van to increase gas mileage? I hav a GMC 95 Vandura
Posted By: frscke1 Re: Mileage modifications - February 17th 2018 11:01 pm
Need to know motor size, tranny, rear gears & type of tires....
Posted By: tuner4life Re: Mileage modifications - February 19th 2018 1:11 pm
Buy a Prius and make the payment with the money you save on gas. These vans don't get good mileage, they just don't. The absolute best mileage numbers I've ever seen from a G20 was about 15mpg.
Posted By: Hasan Ben Sobar Re: Mileage modifications - February 19th 2018 2:50 pm
The above.
Posted By: Reed Re: Mileage modifications - February 19th 2018 5:22 pm
Well, you could install a turbo diesel, but it would take a long time to recver the cost of conversion in fuel savings.
Posted By: jcd74 Re: Mileage modifications - February 19th 2018 10:09 pm
You may already have all improvements you could want with a late model, overdrive trans, TBI injection. All you can do is keep it in good tune. I don't want to know my gas millage, I spend 120 in gas every week. I could make a 480 dollar car payment with that and if I quit smoking at 11 a pack I would have another 660 for a 1000 dollar car payment. I should just quit smoking so I could lead foot all the time in the van.
Posted By: Hasan Ben Sobar Re: Mileage modifications - February 20th 2018 1:23 am
Step up to TPI when you can afford it.
Posted By: abcde06991 Re: Mileage modifications - February 25th 2018 9:24 am
3/4 ton vandura, 350, 4 speed, and the rear gears i dont know, whatever came stock with this van, and the tires idk im out of town but they are 255s
Posted By: frscke1 Re: Mileage modifications - February 25th 2018 3:22 pm
With keeping every thing stock the best you can do is keep tuned, tires inflated & watch your driving habits. I take it it has a ele overdrive tranny being a '95.

10 - 12 is the best you can get driving a stock 350 brick.

Now if you want to throw money at it, thats another story......
Posted By: Lionvan Re: Mileage modifications - February 25th 2018 4:40 pm
I get 15 out of my 90 Chevy. 350 3:42 gears. G20. 75mph highway, a.c. on.
Posted By: abcde06991 Re: Mileage modifications - February 25th 2018 9:04 pm
10-12 sounds about right, id be willing to put some money into it. Whats some things i could do that'll be cost effective and on the cheaper end?
Posted By: JAGI410 Re: Mileage modifications - February 25th 2018 11:07 pm
Find gas without ethanol, that should help! I have hand written calcs on mileage and mpg from the first owner in 1984. He was getting 14-17mpg in the same van. I haven’t done better than 15. Most often closer to 12. There wasn’t ethanol back then, can’t think of any other changes that would make that big of a difference.
Posted By: Reed Re: Mileage modifications - February 26th 2018 1:40 am
Originally Posted by JAGI410
Find gas without ethanol, that should help! I have hand written calcs on mileage and mpg from the first owner in 1984. He was getting 14-17mpg in the same van. I haven’t done better than 15. Most often closer to 12. There wasn’t ethanol back then, can’t think of any other changes that would make that big of a difference.



I can. How about 33 years of wear and tear on the drivetrain? Ethanol does have a lower stored energy than pure gasoline, but there are many reasons other than fuel mixture to explain a 3-5 MPG drop over 33 years. I wouldn't stress about finding ethanol free gasoline.
Posted By: frscke1 Re: Mileage modifications - February 26th 2018 2:54 am
You can spend here ...

http://www.gearvendors.com/index.html
Posted By: Lionvan Re: Mileage modifications - February 26th 2018 3:53 pm
I put a new crate engine in my 90 a year ago. Got more zip. Mileage is up a little . Same tbi .160,000 miles takes its toll in efficiency. I drive all over the country and buy all kinds of gas. I can't really tell any difference ethanol or not but haven't really checked. It seems I go the same distance on a tank though. When I'm on the road for three or flour weeks I don't really care I just buy it.
Posted By: shaggy Re: Mileage modifications - February 26th 2018 6:44 pm
Dunno how the availability of it is over there but LPG conversion is one way to save money.
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