Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

MPGeo · 11-10-2016, 07:36 PM

OK, so just today I was able to get my 1st tank numbers driving the 165-80-15's on.

So from the short test drive I did when I test fitted the tires I knew the care would need all the help it could get to push through with the 16% taller tire... So before I even drove on this tank I had installed the grill block pictured above... So with that said

My tank results began looking really good based on the fuel gauge, but this is a new cluster and I wasn't sure if the fuel gauges were tracking the same. My old one red-lined EMPTY at around 8 gallons or so, and apparently this wan is doing the same. So the numbers are in today 55.2 mpg. Now this is "theoretically" the best tank I've had to date... but only by 0.18g.

So technically Me & My GEO was correct in that, although the mileage was nearly the same as my previous tank, it technically is less mileage if you take into account that because of this tire was so big it basically washed out any the positive effects of the grill block.

I plan to continue experimenting with other tire sizes as I come across them, I'll be looking for specific tire sizes based primarily on Revs-per-Mile, but also taking in account width and side wall height. I'll see what I can find next at local used tire places...

But for now the extra driving efforts needed for this tire size are not worth the washout gain. So I'm back to 12"s and the next tank has been zeroed- so that I can test the effects of the grill block.

Also found me a nice piece of foam that I will be using over the winter to block the radiator opening for a full-block, easy to remove and install while I monitor engine temps.

11-10-2016, 07:36 PM	#125 (permalink)
MPGeo EcoModding Apprentice Join Date: Aug 2016 Location: Wilson, NC Posts: 132 MPGeo - '93 Geo Metro Base 90 day: 67.51 mpg (US) Thanks: 66 Thanked 56 Times in 36 Posts	MPG Update - with 15"s OK, so just today I was able to get my 1st tank numbers driving the 165-80-15's on. So from the short test drive I did when I test fitted the tires I knew the care would need all the help it could get to push through with the 16% taller tire... So before I even drove on this tank I had installed the grill block pictured above... So with that said My tank results began looking really good based on the fuel gauge, but this is a new cluster and I wasn't sure if the fuel gauges were tracking the same. My old one red-lined EMPTY at around 8 gallons or so, and apparently this wan is doing the same. So the numbers are in today 55.2 mpg. Now this is "theoretically" the best tank I've had to date... but only by 0.18g. So technically Me & My GEO was correct in that, although the mileage was nearly the same as my previous tank, it technically is less mileage if you take into account that because of this tire was so big it basically washed out any the positive effects of the grill block. I plan to continue experimenting with other tire sizes as I come across them, I'll be looking for specific tire sizes based primarily on Revs-per-Mile, but also taking in account width and side wall height. I'll see what I can find next at local used tire places... But for now the extra driving efforts needed for this tire size are not worth the washout gain. So I'm back to 12"s and the next tank has been zeroed- so that I can test the effects of the grill block. Also found me a nice piece of foam that I will be using over the winter to block the radiator opening for a full-block, easy to remove and install while I monitor engine temps.