I think it's apples and oranges with extra 18 lbs per tire and and nearly inch wider footprint (think rolling resistance). And the 20" rims are about 8 lbs heavier than the 18" so you're looking at 25 lbs per corner.Curious to see what @powerboost_21 comes up with.
This, plus road noise, is why I chose Yokohama Geolandar G015s over K02s or Generals. The Yokos weigh about the same as stock and are quiet. I haven’t noticed any MPG difference on my PB.Grabbers are sweet looking and awesome traction but they do nab mpg. Just look at mpg for the bronco outer banks (bridgestone dueller) vs black diamond ( grabber atx). They probably have higher rolling resistance.
If you care about mpg look more along the lines of Firestone AT2 or Cooper AT3 4s in P rating.
Would definitely have kept those grabbers though if we hadnt upgraded to a Badlands from a Black Diamond bronco.
275/60R20Which size did you get? Are they P-metric?
Unfortunately most manufacturers limit their pmetric tires to 32 inches and smaller. Hopefully the Tremor will help change that as one of the only manufacturers to make a 33" pmetric tire is General.
https://www.tirerack.com/tires/tests/testDisplay.jsp?ttid=249
Consumer reports also gives the Destination AT2 their highest rating for rolling resistance as well. Only problem is they don't come in big sizes.
Cooper At3 4s and the Continental Terraincontact AT in P rating also have 2nd highest (good rating) for rolling resist on CR, with good traction results.
Yeah 275 70r18 is hard to find in P metric. All I could find is the General Grabber APT. Its lightweight @ 42lbs and "good" (scale is poor, fair, good, very good, excellent) rated for rolling resistance. Seems to be just between the atx and hts60 in terms off off and on road capability.Unfortunately most manufacturers limit their pmetric tires to 32 inches and smaller. Hopefully the Tremor will help change that as one of the only manufacturers to make a 33" pmetric tire is General.