put the 4.10's in your gas milage will go up....

 

I think it would be really hard for an auto to do it. Maybe with every bolt-on possible, 16" wheels, a really high stall and at least 4.10s under ideal conditions. Now a 5-speed might have a better shot at it but my truck when it had just most of the bolt-ons probably wouldn't have cracked a 13.

 

I have mostly all highway miles...(65+mph)wont that hurt gas millage?

 

My brothers is running mid 14's with following mods nelson tune, cai, pacesetter L/T s, true dual flowmasters lt1 fans , ported tb and 160 stat,. Its a 00 rcsb gmc, 4:10 s , 3000 stall and some stickies , It should hit a high 13 easily

 

65 to 75 is where I run on the hwy with my 4.10's and was getting 24mpg, haven't taken a trip in a long time so not sure around town part city and hwy I get 17-18

 

what rpm s at that mph, thats awesome mileage

 

2200 2400, tested it last year when we evacuated for rita lol

 

you actually evacuated for rita? wuss

 

I wouldn't expect to lose more than .5-2mpg depending upon what gear you have now. Some have even claimed to gain mileage going to a lower (higher #) gear.

 

Good info..ill have to think about it more..