Best mpg

[dla]

you know ..... I just drove Satan's motorhome to AZ and the best mileage I got was 9mpg as apposed to 6.5 being the worst. I got the 9 mpg running 86 octane e-10 in New Mexico....... did it for 2 tanks. the worst mileage came from 89 octane no blend i got in Oklahoma. Dropped back to a solid 8 mpg the rest of the trip after I bought 87octane in Holbrook AZ all the way to quartzsite also on e-10. I think octane is more important than blend. low compression engines (8.5:1 in a 1995 460) do better with low octane gas. I know the reason for the low octane was the high altitude but even running 80 mph up and down some hefty grades it was getting 9....... I bet it would have got 10 or 11 on flat ground. getting back to the question at hand.

save your money on the mods and get a vacuum gauge, keep your gauge in the green.

Was it carbureted? If so, it makes sense that it got better.

 

[chico4554]

its the latest and greatest invention for good gas mileage. Check it out.

 

[08RangerXLT]

I switch to amsoil last oil change and have not seen a noticeable difference in fuel mileage.