Does the computer read hi or lo? My numbers were off the computer.

 

My computer reads typically 14.3 litres/100 kms, (which I think is around 16 or 17 mpg US) but a quick calculation at the pump gives me much worse mileage. I can't remember the results from my last fill because it's too painful to hold that info in my brain . . .

 

I go by the little computer thing in the overhead because the last time I checked it using the math, it was actually about 4 mpg lower. (overhead head @18, actual was @14, on a trip)..so I too just block the low number out.

 

you have a 700 mile range tank? dang i need to upgrade

 

Riff raff - were you able to mount that tank underneath or in the bed? Even an extra 10 gals would be enough for me. At least make it to 400 miles.

 

Do you re-set the overhead each tank-full?

I think this is either an average from last reset or a moving average of some sort.

If I want a good calculation, I reset the overhead before a big trip, and it seems pretty accurate. Not close if I just let it run on over several tanks, city and highway. It should be really accurate, since the injectors meter exactly how much fuel it used.

 

I reset it about once a month.

 

If I do all highway is driving I can average about 20-21 mpg, now thats doing the math at the pump miles\gal=mpg. But now I average about 40 miles highway a day with about 10 miles around town and I average around 17mpg (now that has been on SC 91 tune) Just changed back to 87 tune so I will have to see where it goes now.

 

Its a custom fabbed tank that sits in the bed. I was going to have a round tank made to fit where the spare is but I felt it important to have the spare on long trips. The tank has its own fuel gauge and feeds the main tank by a 160 GPH fuel pump via a "dead man" switch.I've got it set up so I can pull the entire system out of my truck in about 10 minutes when not in use. Its also emissions compliant.

 

Maybe I'll leave the computer for a while. I usually reset at each tankful, along with the odo. Habit from the motorcycle days.