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Poor gas mileage

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Can anyone offer a suggestion as to why my fuel mileage is so poor, I have played with several different tunes on my quadzilla and still can’t get over 14 on the highway. I’m running 35 in tires. I’ve heard it could be injection pump but it was replaced not to long ago and it’s been running great so it’s hard to believe that’s the problem. I’m also on stock injectors

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  • Mopar1973Man
    Mopar1973Man

    Basically what it comes down to is reducing rolling resistance, rotational loss, and drag. More you lean towards the 3.73 ratio the lower the drag is on the vehicle. Like my design in tire is to put m

  • Dieselfuture
    Dieselfuture

    Make sure it's ashless,  most run supertec  https://www.walmart.com/ip/Super-Tech-TC-W3-Outboard-2-Cycle-Oil-1-Gallon/16795065

  • Ed ke6bnl
    Ed ke6bnl

    I went to 35 in tires and the mileage dropped, I bought a crashed 99 Ram  with 4:10  gears and 80k motor and DTT transmission and exhaust brake Cheap used the 4:10 gears in  my 98.5 ram and it is a go

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Actually my trip meter doesnt work and I'm not sure odometer is. I used Grant's pass as an example because I know it's a 670mile trip.

Actual tire height is 34" I have that set but haven't checked odometer to see if it's even reading more than a few hundred miles a tank 

 

So yes you are correct I have no concrete numbers

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On 7/29/2018 at 2:02 PM, RottenMutt said:

what are your exhaust temps at 65 mph cruse?  i'm thinking late injection timing?

Around 800 pretty high and I’m not happy with it. You think too much timing?  Also on stock injectors still at 210k

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7 hours ago, Mopar1973Man said:

More timing lowers the EGT's.

 

Less timing builds more boost.

What would be a good parameter to begin adjusting? 

  • Owner

Like I'm running 14, 17, 20, 23, 26 for timing. Then cruise timing is plus 3 with load limit of 30% right now. Bouncing 18 to 20 MPG.

 

Those 34 inch tires are not helping. I'm getting ready to drop 31 inch tires for 30 inch tires. Better gear ratio and power.

  • Author
On 8/4/2018 at 10:35 AM, Mopar1973Man said:

Like I'm running 14, 17, 20, 23, 26 for timing. Then cruise timing is plus 3 with load limit of 30% right now. Bouncing 18 to 20 MPG.

 

Those 34 inch tires are not helping. I'm getting ready to drop 31 inch tires for 30 inch tires. Better gear ratio and power.

Okay should I start with those numbers for a baseline? Im on stock injectors. I’m also doing a 4:10 swap right now finished the rear yesterday gonna start the front today. Should bring my final ratio to about 3:69. I know rotational weight still has its effect but the gears should help quite a bit still

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