BLDTruth

With those tires, gears, intake and electrical fan, I can see 21 mpg with very conservative driving habits. 30 is a pipe dream. If you got 30mpg, you are not driving in a way that is representative of the way 99% of people drive and should not be promoting it as a rational possibility. That's my story and I am sticking to it

unit505

There was one member a year or so back that was getting 22-23 at 70mph with the same 4.9, gearing, trans and mods that I have, but he had done extensive ignition work, msd box, etc and I believe he'd done the chevy 250ci rockers swap and high flow fuel injector swap as well. The fuel injector upgrade with the high pressure mod that has to be done was way above my head. http://www.bigblocksix.com/Eddie/injectorswap/

95SWB

Okay so I did some city driving and recorded my mileage using gps, I drove 22.3 miles predominantly 35mph and under reaching 55mph at most. I filled gas just above brass flapper in the filler neck drove about 53 minutes and filled gas back up just above filler neck and used .86 gallons. Averaged just shy of 26mpg.

ericantonio

That's awesome!!!!

BTW what app is that?

95SWB

Gps speedometer on android

95SWB

Okay I drove right at 200 miles today, didn't have gps speedometer because I was using google maps and recorded my mileage, 98 miles through the country on farmtomarket roads driving as hard as I could rpms constantly between 2500-4000rpms, my bump is at 4850-4900rpms and stock cam peaks at 3800rpms I believe. I never hit 5th gear the entire way there and it was mix of city and hwy miles. 98 miles consumed 5.63 gallons of gas averaging 17.41mpg. On the way back I took two interstates, first speed limit was 75 and I drove 75-85, 4th gear entire time 3000-3500rpms with flow of traffic, although half of traffic was doing 85-95. 37 miles on first interstate I consumed 2.08 gallons averaging 17.78mpg on the second interstate I drove 63 miles consuming 1.98 gallons of gas driving 65-70 5th gear 1750-2000rpms averaging 31.81mpg. It is definitely determined by how you drive and not the truck. It's been almost a year since I changed oil and oil filter, my air filter is very dirty and I need an alignment. If I fixed all the issues I'm sure my mileage would increase.

sdmartin65

I'd say your reported mileage is so high because the method of calculating isn't very accurate. You see this a lot with owners of the newer trucks with the digital mileage calculator.

Why not fill up the tank or tanks if you have them, reset the trip meter, drive till the tank is near to empty then fill it up. If your speedometer is not accurate it's always off by a specific percentage and that's easy to figure in mpg calculations. You get decent mileage no doubt but from your post I'd say your overall will be closer to 20 give or take.

mattbarron94

How do you figure the gallons used after each section of a trip? Do you refill after every section?

95SWB

How is it not accurate if I use gps mileage and make sure fuel is at exact location every time I put gas in it?

95SWB

Yes I would fill fuel to just above brass flapper in filler neck then drive record miles refuel to same spot just above brass flapper in filler neck. I don't see a more acurate way than how I am doing it.