I have a 410 stroker in my aussie charger. it weighs around 3100lbs . On a recent trip to our annual chryslers on the murray meeting 550 kls (350miles) I got 21 mpg going down and 22mpg comming back sitting on a comfortable 120 kph (about 75 mph) My car has a 410 with 236 @ 50 thou roller hyd cam with edelbrock heads 800 avs carb five speed manual box and 3.91 diff ratio. The best thing I ever bought for the car was the air fuel ratio guage that has enabiled me to tune this car so good. It has run a best of 11.4 down the qtr but yes I do lighten it by taking bumpers,sway bars and passenger seat out to run these times. With the five speed and 28 inch tyres it cruises at 110kph(70mph) @ 2400rpm. Just in a niece torque curve and very pleasant drive! I know our imperial gallon is slightly larger than your US gallon but I think that is really impressive considering my 351 clevelands in the early eighties could do no better than 15mpg even with there 2.76 diff ratios in standard form. Hell even back in the seventies my 340 charger with sic pack and 3.91 diff would get 21mpg it is just hard to not use that right pedal too much but with all the HWY Patrol Cars on our road networks and the large fines and pionts systems it is a big deterrent to keep the speeds down compared to the early seventies.
