4200 fuel mileage ..
Just came back from the can-west inliners bbq.. 8 1/2 hours drive one way
The drive home involves climbing some 4000' elevation changes twice. The 4200 got 21-22 MPG going up these mountains and down.. . averaged over 270 mile used just over 13 US Gal. (51 liters).
So on a flat highway I'd guess it would be 24-25 MPG which is a huge increase over the 13 MPG with the previous 292.
The engine is in a 51 GMC with a 4L60E going into a 9" with 3.50 gears and 275/60R15 tires. In OD locked up about 2100 rpm at 70 mph.
Last edited by efi-diy; 06/17/08 03:49 AM.
