just picked up new tahoe, only has 1000 so far, how long (miles) b4 i see some decent mpg??? thanks

What's your definition of decent mileage? It won't hit 25 but 16-17 may be obtainable, mostly determined by the weight of your right foot.

it should be just about broke in and id say no more than 500 more miles and your done.

When My truck was stock (before blower and exhaust, headers) I Always ran Midgrade fuel, I filled it with Premium and got 40+ more miles per tank. from then on I always ran premium because of the better milage. If you figure it out in pennies per mile, premium is a better deal. It cost more to fill up, but you'll go farther. which becomes cheaper than buying regular or midgrade.... try it......

i tryed that in my 4cly s-10 a it didnt help any with 93.

soooo, roughly 1500-2000miles is the break-in period ????

You won;t be able to measure any difference in mileage. The people that do have to have had a problem as todays engines are made to closer tolerances and will run fine right out the door.

You won;t be able to measure any difference in mileage. The people that do have to have had a problem as todays engines are made to closer tolerances and will run fine right out the door.

X2...my wife's Yukon Denali has been really consistent with fuel mileage since it was new. Our 6.0L Vortec-powered Denali gets between 12 and 14 mpg in the city (the variable being traffic density) and 18 mpg on the freeway (70 mph).