Hello All, I am a 2nd year member to FMCA but have done a lot of RVing in a short time. Our rig is a 2000 Rexhall 31 foot Aerbus no slides. Toad is a 86 Jeep XJ Cherokee 4 door. Gas milage is 8.4 -8.8 constant . Speed is 55-60 Never much more. 90% on cruze control. The Rexhall is slightly aerodynamic and a low profile for a A RV. we run pretty Light I est. under 17,000 Lb. The FORD V-10, 115,000 Plus miles. had 92,000 on it when I bought it I had some Oil burn a qt every 1500 miles. I added LUCAS Injector cleaner. Good god it was better then a tune up . Added it in the mourning some place in Texas going west on the I-10 , after about a hour the engine gave a surge changed tone it just went zoom . 2 years later and adding the LUCAS aproz every 3rd tank very little oil burn . If any at all I add LUCas top oil to Engine. Now running all synthetic oil. See you all in WY in June. Jack