9.5 MPG!!!! Please Help!!!!

[INSIDIOUS '86]

Originally Posted by nosfed2

Ok so i drove it to work again and the numbers got me concerned so i am gonna do another test tomorrow. But here they are The First Time i went to the gas station and filled it till it popped and than filled again and it popped real quick so i know it was full. I wrote down the beginning milage which was 40093 and drove it straight to work and back to the same gas station and same pump and wrote down the milage again 40139 and filled it up again till it popped and than filled again till it popped real quick and it used 4.84 gallons which comes out to 46 miles drove and divided by 4.84 which comes to 9.5 mpg so I took your guys advice and switched to 3.73 rear gears and drove it today. I went to the same gas station and same pump and topped it off again doing the same steps as before and than wrote down the beginning milage 40458 and went to work i than went back to the gas station and wrote down the milage 40511 and filled it up again till it popped and than filled again till it popped real quick so i knew it was full and it used 2.78 gallons which comes out to 53 miles this time but i did go to my house and than left for work which added 7 more miles but that comes out to be 19 mpg? that seems like a huge gain but i did notice that i was giving it a lot less pedal and last time on my way home the gas gauge was dropping down to a line below F but this time it never moved from over F? I will test it again because this seems to good to be true...lol

It's hard to calculate for sure what your gains are that way. What I've done is take a milk jug and run it to the fuel pump and block of the tank lines and measure out an exact gallon reset my trip meter (i have one (: )Then drive in the city and see how far I get then fill it and go to the highway pull over measure on exact gallon and do it again.

Many varable such as wind and hills but you get much closer to the correct number. Also losing the tailgate helps bunches too as well as electric fans and good exhaust with headers. A sharp tune on the carb with an efficiant intake and your about as close as you can get. Anymore after will net small changes but worthiness is is up to the driver.
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[piecesparts]

My bet is that it will settle out to around 14 MPG.

[nosfed2]

Well i drove it to work again today 53 miles round trip and went back to the gas station topped off and it used 3.7 gallons which come out to be 14.32 which is about 5 mpg better than i was getting. So i believe these results now...lol...turns out last night the pump i was on was kicking off early because of the angle i had it at...so today i filled it till i could see it in the neck..lol...and
repeated that step when i went back....well now on the a electric fan and a alternator upgrade..thanks for the help!!

[Rufton]

Nice.
What rpms gives you the 14mpg?

[nosfed2]

At 55 mph the tach says 2000 rpm and it climbs up the hills with out down shifting where it was always in and out of gear before. The cam I have in there is a RV cam and it makes its best power at 2000-3000 rpm so I have found that if i can keep it around there as much as possible it helps my MPG..

[INSIDIOUS '86]

Peak torque is where it's most efficient so your Definitly in the right rpm band.
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